Mass-produced mayonnaise, like Hellman's or similar. The mere thought of it makes me gag. Homemade is fine. Same with salad dressing. Ranch out of a bottle I find revolting, but I make my own creamy dressings with chevre (I have no idea if this is something you're supposed to do but I think it tastes great) or creme fraiche. Canned tuna. Fresh tuna is one of my favorite things, but canned it just tastes and smells like cat food to me. Pickles. I like pickled ginger, but not pickled cucumbers. Fresh ones are fab, but I hatehatehate pickles. Pickle juice on my sandwich from a too-close pickle encounter makes me somewhat unhappy, but I try to deal with it so as not to be a complete ass. Any canned vegetable, especially peas. Refried beans. Also, baked beans - the cloying sweetness is just revolting. Any kind of overly sugared, cheaply made dessert. Except: cool whip and jello on occasion, and jello instant pudding when I've had dental work done. Potato bread. ICK. Pecan pie - what the hell is that sugar sludge? ack! Penn Pilsner - it's the new PBR in my city, fast becoming the uber-cheap hipster beer of choice. Look, if you're going to make a shitty beer, make one that doesn't assert itself, like Pabst. PBR tastes like nothing, and for 75 cents, that's fine. Macaroni and cheese from a box. My roommate loves it. SO WRONG. I like most veggies, but can't get into lima beans. Damn, I'm a picky little bitch, aren't I?