Lite beer is awful…so is “light” beer, meaning the color. Some all time digusting beers? Budweiser, Pabst Blue Ribbon, Milwaukee’s Best.
(1) Piel Bros. “Real Draft”-the “beer you first loved” aaarghh! Rancid panther p*ss tasted better!
(2) Narragansett Lager (at one time, made in Cranston, RI): this was referred to by my RI friends as “headache” beer!
(3)Gablinger’s Low Calorie beer - a marketing fiasco, this stuff was the first “light” beer-it tasted exactly like soda water!
(4) Ballentine Pale Ale: ever felt like you have a nail stuck in your throat?-this is what you felt like after a couple of these
(5) “SINGHA” beer (Thailand)-my friends in the AF who served in Thailand called this stuff “embalming fluid”
I would have to agree about Genesse (both the 12 Horse and the Cream Ale) but hands down the winner (err loser) is…
Chopper
Brewed and bottled for an early Sturgis rally. Imagine Corona left outside in a carwash bucket for a few days. A strong showing but distant second is Bicycle beer. Bad beer with fruit flavoring! That $.99 should have been my first clue.
I was real lucky in college. I got to work at a liquor store that took pride in their beer selection. We kept over 300 different beers (easy to do in Denver circa 1993)and the vast majority were quite good. However, every now and then we would get a case of Tecate Light, or Midnight Dragon. Not even the regulars would go near that stuff.
5 bonus points for anyone who has actually finished 12 ounces of Pabst Genuine Draft Light.
I never liked any dark beers like Guiness nor most, if not all, domestic beer. Long live Heineken and Corona!
I’ll chime and agree with earlier posters that Genesee is by far one of the worst domestic beers I’ve ever had (especially the Cream Ale - baaad experience with that stuff). Others I couldn’t stand were (in no particular order): Black Label; Red, White, and Blue; and Stroh’s.
I also attempted to drink a generic beer once (Kroger Kost-Kutter Beer, if I remember correctly), but when I felt chunks of ??? touch my lips, I immediately threw the can away.
Zima, which is a beer isn’t it? Also Sake, which is from grain.
Do NOT name those two in one sentence, you heretic 
Oh sorry, I forgot that Corona comes from America’s Heartland – Mexico.
“Tequiza”
Holy shit, finally, someone who agrees with me on this. Tequiza blows! I don’t know what the hell is in it, and have no idea how it even passes off as beer.
I also throw in my vote for Tequiza. Dang, that’s some nasty shit.
I believe that Coors has to be my all-time favorite beer to hate. It ranks somewhere between watered-down beaver piss and dirty dishwater.
BTW, I had ONE Tequiza, and poured most of it into a trash can at a Carls Jr.
It’s a disgusting insult to both Tequila and beer at the same time.
I respectfully request a moment of silence for both Tequilas and beers at this juncture ::Moments of silence:: You may now crack the top of your Favorite beer and commence to drinking it.
Oh, an JavaMaven, I had many coors LIGHTS this weekend, but I had it after about 5 Guinnesses, so I couldn’t taste it 
I damned sure felt it later that night!
-Sam
Although I won’t drink anything with “Ice” or “Chili” in the name, the worst beer I’ve ever had is Maccabe. It’s made with Dead Sea water so it must be good, right? Right?
Rolling Rock is beer flavored mineral water.
I once tasted, totally by accident, a Colt45 Cool. This is Colt45 with menthol in it. Mentholated Colt45. And I tasted it. Yuck.
The worst beer I ever had was when someone got my brother one of those “Beer Across America” things–you get a sixpack every month of various microbrews. None of them were great, but the worst was a maple flavored beer. It tasted like someone had poured a healthy dose of generic imitation maple flavored syrup in the bottle. It was so bad, my bro and I both had a swing and then ceremoniously poured every bottle down the drain. ::shudder::
Number two on my worst beer list is Pete’s Hazelnut Some-Thing-or-Other (Porter, maybe). Pete’s is usually a good brew; I really like the Pete’s Wicked Ale. But this stuff was nasty–way, waaaaaay to much hazelnut flavoring, like someone had added a shot of that hazelnut stuff they put in coffee. I don’t know why I thought I might like it in the first place, aside from the fact that Pete’s had always made good beer before. So it was bad, but not as bad as the maple beer, since I actually did finish the six-pack of the hazelnut beer; after about four the taste wasn’t as objectionable. 
But dammit, why are people trying to make beer that doesn’t taste like beer!?!
There’s also the cock-ale that I mentioned in my mailbag article, where they add a dead rooster to the beer–I think I could do without that too. However, I’ve never had it; I’m not sure it could be worse than that maple beer…
Regal Brau made by Huber Brewing in monroe, Wisconsin.
I drank 3 bottles out of a case and dumped the remaining 21! Blech! Worst beer EVER!!!
Hamms. My father in-law drinks this. I just can’t get it down.
Wisconsin Club. Very flat, tasteless shit.
Samual Adams Honey Porter. Tasted like rotten crotch smells.
Paulies Bad Batch 1993. Sorry, I had to toss this in. I tried brewing a fruit flavored beer and ended up with a foul mess that was 19% alcohol! I thought I was going to go blind when I tasted it!
But it was still better than Regal Brau!
I didn’t mention Steel Reserve, since it’s a malt liquor, but malt liquors are being allowed, so I’ll second GaWd on that one.
Of course I still drink it even though it tastes horrible, because it’s so strong. Fortunately I can get it in short neck six packs, so I don’t have to by 40’s. Makes an alright chaser for my beloved Jim Beam.
Billy Beer. Iron City.
I’d also like to hang the person who thought it would be okay to use fruit as an adjunct. Raspberry and cherry beers, indeed–Hey, here’s an idea: DINGLEBERRY BEER!
Tequiza. Milwaukee’s Best. Red Stripe.
As I sit with a Bud in hand, I’d like to nominate Sam Adam’s Triple Bock that was out a few years ago. Tasted like Niquil, but without the sweetness. Second runner up is Coors Light. Absolutely no flavor
Black Label, or Mickey’s Bigmouths. It’s a toss up.
Hmmm. Maybe it’s a regional thing, but everyone from Minnesota, Wisconsin and Iowa knows that Pfeiffer is the worst beer ever bottled…on a number of levels.
Taste: Like soured mule sweat
Bouquet: It comes pre-skunked right from the brewery. No need to leave it out in the sun for a week; it already reeks. (a trait it has in common with Colt 45)
After effects: Make sure you have a full roll of TP and no plans for the next day. (Medical terminology: The Pfeiffer Trots)
So why did anyone ever buy it? It was cheap, duh. Back in the early 70’s you could get 3 cases for $7.00 if you brought in the empties. That’s just a little less than 10 cents a beer. That’s called such a deal in Minnesotan.