People be hating on some of my favorites in here, lol. :'( Oh I love honey bunches of oats. And cap'n crunch. And--
Anyway. Honestly, there's very few cereals I would claim to hate. Raisin bran is probably the closest, since I haven't been into eating raisins at all since I was little. I had a time when I absolutely loved them, now I'm indifferent towards them and would rather eat other things. I have eaten that cereal in recent times with few problems, though. I just won't get it on my own.
I feel like there's some kind of cereal featuring dried fruit that I'm not a fan of, but I can't remember what it is at the moment. It possibly had to do with dried strawberries.