Post stuff that you don't like in general. Plain and simple. Just don't argue if you like something that someone has posted. Also, you don't have to post why you don't like the things you're posting.
Ali Project: I don't know why, but I just find their voices rather screechy and unpleasant to listen to. Why they're so famous, I'll never know.
Ranch dressing: It tastes sour and overpowering. I tried it on a salad once and felt ill.
Peas: These things are disgusting. It kind of makes me wonder why humans decided to cultivate them in the first place.
Ketchup (and many other condiments): Ketchup doesn't even taste like tomatoes. It's the unfortunate meeting between tomatoes and vinegar. ._.
Bats: 'Nuff said.