Hmmm, interesting question.

Please don't feed me bananas. Or sweet potatoes, especially those fixed with marshmallows melted on top (shudder). I won't make a big deal of it at the table, I'll just "forget" to put them on my plate.

I will make a big deal of Campbell's tomato soup. IT WILL NOT PASS MY LIPS!!! For that matter, most commercial tomato-based products (spagetti sauce, etc.) are not fit for human consumption IM(insufficiently)HO.

As a matter of principle I don't eat veal, or endangered species - stuff like that.

I'm sure there is more, but I can't think of anything else right now. Generally, I just eat what you put in front of me, and it shows.