Sauerkraut - My wife and mother don't like it either, but they like reuben sandwiches. I can't eat it in anything.
Diet Soda - When that's the only thing people have, I go without. I really hate it when they give it to me without telling me that it's diet. I always know.
Tea - Hot tea and Iced tea. It all tastes like a suit that's in need of a cleaning. My parents and sister also hate it. We always talked about how we wanted to like it, and how good iced tea looked when others were having it but we can't drink it at all. It really irritates me that when at business lunch banquets sometimes they will serve iced tea only and no water.
Grapefruit - Bitter, sour, I don't know how people can eat this stuff without sugar. My mother used to give this to us at breakfast and the only way I could eat it at all was if I buried it in sugar so that I would not be able to taste the grapefruit. I figured out later in my life that if you had to put that much sugar on it there was no point in eating it. It came as a shock to me that there were people who actually ate it without the sugar! Who were these crazy people!?
Cottage Cheese - too curdy. And it looks too much like bleached vomit.
Cantaloupe - Just a weird taste.
Beets - I'm not alone on this one. Somebody upthread said they taste like dirt. Somebody else said "not the pickled kind." I would agree with that, the pickled kind taste like pickled dirt.
Olives - My father and I are the only ones in our families who hate olives. I have never had an olive in anything that I didn't hate. If they are in a dish I can taste their presence and have to pick them out one by one. The info in this thread about how olives are inedible unless cured for months makes me feel that I've been vindicated. Apparently, God did not intend for olives to be eaten. Us crazy humans!
Ham Salad. - My mom started making this for my lunch one day after finding a recipe that was similar to what she used to have in her younger days. I tried to like it. The combination of fine ground hammy mush mixed with Miracle Whip was one of the vilest memories of my childhood. Even though she loved it, I had to tell her that I didn't want it ever again. She was hurt, but respected my wishes.
Cooked Oysters - love them raw or smoked and actually chew the raw ones, but just can't stand that burnt flavor when they are in soups, stews, stuffing, or fried.
Raw Clams - Love all cooked clams, but that snotty, smelly glop on the outside of a raw clam gets me gagging before I can even get close to swallowing it. I have never been able to get one down and then have to find some way to discreetly dispose of the partially chewed clam corpse.
Dried Tarragon - After ruining another dish with this overpowering bitter-tasting weed masquerading as an herb, I threw both bottles we had in the trash and informed my wife that never again was this ersatz herb to darken our spice rack again. One of these days I might give the fresh kind a try, as I'm sure I've had it in restaurants a number of times without tasting that taste that I hate.
The following are not mainstream, but as long as I'm here,
Irish Whiskey - People who hate scotch should try this and learn what
awful really is.
Brains - Had once in two tacos and never need to try them again. They taste exactly like one would expect them to taste, funky, mushy, awfulness. The taste stayed with me all day. I tried brushing my teeth and mouthwash and still couldn't get the taste out. The vivid memory of it still haunts me to this day.
"Good stuff, Maynard." Dobie Gillis