Let's see. I'm really not a picky eater; I just don't eat very much. But some things that I absolutely detest are:

Big Macs from McDonalds. I had one once and nearly threw up.

Citrus skin: How can anyone eat this stuff?! Eww!

Cucumbers and pickles: Never liked them, never will.

Pretty much any vegetable EXCEPT carrots, lettuce, tomatoes, basic salad implements: Stuff like Brussels sprouts, cabbage, radishes, etc. are absolutely disgusting.

Condiments EXCEPT for ketchup, barbeque sauce, and mayonnaise: Stuff like horseradish and tartar sauce is absolutely horrifying. I don't like mustard either, but it's okay in small doses.

Fish: I absolutely hate fish. Shellfish don't count. I LOVE shellfish with a passion.

Nissin (I think that's the brand) Peanut Thai Noodles: I couldn't even eat it after I made it. The smell alone made me sick. I shall remain loyal to Maruchan forevermore because of that stuff.