I love Grape Nuts, with sliced green grapes and milk warmed in the microwave. 
My nominee is Cinnamon Toast Crunch. It does downright evil things to milk.
Trader Joe’s raisin brain. An unholy mix of cardboard and kitty litter.
I love Grape Nuts, they taste just like wild hickory… okay point taken.
Grape Nuts are great, they just need milk, honey, and warming up before you attempt to eat them. Gets them nice and squishy.
I’ve gotta add to the peanut butter cereal pile-on. Grotesque.
A memory that is burned in my mind from when I was very young: my mother bought us kids Grape Nuts, and wanted us to eat it because it was healthy. Several days in a row she attempted to cajole us to eat it, telling us how big and strong it would make us, how good it was for us. We wanted no part of it, but she kept trying.
Then, finally, she tasted it herself.
We were never served Grape Nuts again.
Sounds like Weetabix, which I love.
My personal anti-favorite is probably Fruity Pebbles, which (I recall) tasted like nothing found in nature and became soggy and somewhat slimy almost immediately upon coming into contact with milk.
Not weetabix. Apparently it was Cracklin’ Oat Bran. Walgreens: Pharmacy, Health & Wellness, Photo & More for You
I love Grape Nuts (just cold with milk) and Shredded Wheat.
Somebody gave me a box of Weetabix once. I can’t really recall the circumstances.
Thing is, I thought they were some sort of cracker, like Triscuits. I didn’t learn that they were supposed to be served in the manner of Shredded Wheat until much later.
I’m surprised more people haven’t mentioned this one. I’m guessing the photo on the cover of the box scared people away from even trying it, but there it is still on the supermarket shelve.
Grits.
.
.
Tastes like ground up gravestones.
All those people with sticks up their asses?
How do you think they got them?
Great posts. But grits are great with cheese (I can’t believe I just said that). And I do like a box of Lucky Charms once in a while. After all, they’re magically delicious!
Cracklin Oat Bran is delicious! It may look like dog treats but it tastes like little
Granola bars. Did you ever taste it?
Yes. It was not a positive experience. 
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Sounds like Weetabix, which I love.
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Weetabix has to be my least favorite breakfast cereal. They sell it on some stores where I live so I decided to try it thinking it was going to be the British version of Shredded Wheat. It wasn’t. It was like eating soggy cardboard. I only finished the box because I thought maybe the taste would grow on me (it didn’t) and I hate wasting food.
Shredded Wheat. It’s Brillo made out of wheat. Not rich flavorful wheat either. It only tastes like wheat enough to make you realize it would be better if it was totally flavorless.
George Carlin said this in a spoof of a TV cooking show:
"…and throw them away, folks! They’re no good! You can’t eat them damn grits!
"[audience applauds]
"A lot of veterans in the audience, eh?
"Remember the first time you ordered ham and eggs in the South?
"‘What’s that white stuff?’
"‘Hell, them’s grits!’
“‘They’re movin’, man!'”
I love my sugary cereals, but Berry Berry Kix tasted foul on the first spoonful. Never again.
My Mom(from England) and I eat Weetabix with some margarine on it. Like a cracker. I know it’s a cereal, but it does work as a cracker.
I am a huge cereal fan. Love it covered in sugar, love it without. I love Grape-nuts, those wheatabix biscuits (warm with butter and a sprinkle of spice), any variety of Cheerio.
But I loathe Cinnamon Toast Crunch. They taste fine at first, but after a few bites I taste wood. Sugary, cinnamony wood.
Cheerios. I know they have been around for a long time, a fact I find unexplainable. Think of life preservers shrunk down to the size that would fit creatures an inch tall. I have never eaten a life preserver, but having eaten Cheerios, I don’t need to.