Yogurt. When I was a kid it was all about Dannon fruit on the bottom yogurt. Strawberry and Blueberry were my favorites for years when I was a kid. Then right around 9-10 years old the shit just turned nasty.
Tofu anything. - In the late 70's, people seemed to discover tofu. My aunt and uncle put my folks up on it like "y'all can use it instead of beef to make hamburgers". Moms found a recipe for tofu burgers and the first few times the shit wasn't bad; I fucked with it. Right around the same time that I lost my taste for Yogurt, all things tofu became vomit-worthy. Ain't fucked with it since.
According to my grandmother, I used to devour fried chitlins when I was a toddler. I can't even be in the room with them and it's been that way at least since I was 5.
Egg custard pie - Moms used to make it and I used to fuck that shit up. I think I was 11-12 years old when she made some and I bit into it and almost threw up. Never again.
Sweet potatoes/sweet potato pie - Can't do it. When I was little I could eat it. Nowadays I simply can't.