Tomatoes. Tomatoes on so many levels. I like their by-products like ketchup and marinara and stuff, but the actual thing just grosses me out.
Also, mushrooms. My other family members swoon over mushrooms, but I personally think they taste like dirt and have a gross cold rubbery texture. Ugh.
Other than that, there's not a lot I won't eat. I mean, I don't particularly like fish (salmon and fired catfish, however, are another story) or squash. But that's it.