My tastes keep changing, used to not be able to stand olives but they are growing on me now, similarly things like houmous. Couldn't stand coffee until I was at uni and am now renown for my coffee addiction. Yoghurt I go on and off.
Avocado is one thing I hate the thought of, guacamole too (obviously).
Raw meat/fish stuff turns my stomach, sushi, rare meat etc... I just don't get it, it's cold and slimy and just urgh!
Stuff like fruit and nuts in salad too or fruit sauces on meat, not a big fan of mixing sweet and savory save a few examples (gammon and pineapple, sweet and sour...).