Mushrooms are my first response.
Yellow mustard, but brown mustard is fine.
Mayonnaise and Miracle Whip both.
Italian sausage, because of the fennel.
Commercially made rye bread, because of the caroway seed.
I don’t exactly hate liver, it’s just that (as I’ve mentioned here before) it reminds me too much (appearance and smell-wise) of human autopsy livers.
I developed an antipathy to beets because they used to serve them as a cold vegetable with hot lunches at school, and they tasted like crap and bled all over everything else on the plate. Different-colored beets I might be able to tolerate, but I’ve avoided the entire beet clan ever since experiencing those wretched purple things.
Real mayonnaise and MiracleWhip should never be mentioned in the same breath. Mayonnaise is excellent, MiracleDung is utter garbage.
I somehow acquired a bottle and I use it very slowly as a substitute for other bitters (like ~0.1 oz at a time), otherwise I can’t stand it. I like Angostura alright, but Campari is rough. And now hipster-types drink that neat or mixed with just soda water similar to other things like Fernet.
I don’t mind cilantro, but your description actually made me queasy.
My problem with raw onions isn’t the taste, either, but the taste of onions in my mouth for two days afterwards, no matter how much I gargle or brush my teeth. It’s easier to just pick them off and give them to my husband.
Yogurt for me. It’s just sour nastiness to me.
I don’t think you’ve actually had lamb. It isn’t beige, or even close. It’s red, like beef.
Fish. I hate the look, the taste and the mouthfeel of fish. I can eat shellfish all day anyday, but fish of any sort, no thanks.
Cheese sauce. I hate anything in a cheese sauce, especially that abomination Mac and Cheese.
Yeah, that would be easy… it’s the opposite that would be next to impossible.
Shellfish.
I can eat small prawns but won’t touch Lobster or crabs, and the sight of oysters makes we want to vomit. I tried one once, like putting a piece of fish flavoured snot in your mouth. Horrible things. Ordinary fish I can eat sparingly and I’ve just discovered I like canned Tuna after avoiding it for 30 years.
Also, Mangoes. I can’t get the obsession with them, they’re fucking awful. Flavour, texture, everything. Yuck.
Cantaloupe. (AKA Rockmelon). Just the smell of it triggers dry retching.
While I don’t “hate” them as such, I really dislike sliced pickled cucumber on burgers. I like cucumber in a salad and I don’t mind dill pickles on the side with a ploughmans lunch, but in a burger? Seriously what dickhead came up with that idea and how did it catch on?
Good point. That would be an interesting exercise though, create a list of everything here that at least 1 person hates, then try to come up with a menu that contains none of those items that would get a good review at a dinner party.
Like I said: plain toast and saltines. Maybe water.
No, scratch the water.
Can we get unsalted saltines please? Crust free bread please. No jelly either, I don’t like the texture. 
Who puts olives in nachos? Nachos is tortilla chips, melted cheese and jalapenos.
I’ve never had spinach like this and it sounds delicious.
Awesome, more for me. I always order extra pickles on burgers.
As for me:
Chocolate. Especially those fancy expensive ones. I can handle Hersheys once in a great while but that’s it.
Beef. Steak and ribs, yuck. But weirdly I love burgers. The greasier the better.
Salad. Salad isn’t food. It’s what food eats.
Hehe. I guess Soylent thought those green things were olives. 
Doughnuts.
Many, many places. The black variety of olives. I often have to ask “no olives.”
Now that’s just crazy talk!
I thought of another thing I hate that many seem to love: anything curry.
In Texas, that would probably get you shot.
ETA: And no jury would convict the shooter.
Coffee. Nope. Not my thing. I’m weird, I know…
Cherries. Gross (my mum lives in a cherry-growing region, and each year I cop the 'Let’s go out and get some U-Pick cherries because everyone loves them!).
And, as a registered, certified, licensed and accredited Chocaholic - can I just say that those fancy-schmancy (technical term) chocolates that come in a pretty box and consist of a thin shell of chocolate wrapped around some incredibly complex filling like pistachio-flavoured praline with angel tears … are a complete waste of time and money. Chocolate is best, like most of our favorite foods, straight, simple and unadulterated.
So that’s the C’s covered…
Some of you are really weird.