Cream of mushroom soup - it's like creamy mushrooms, it's just vile. I like mushrooms, and I like soup, but creamy thick mushroom flavour gunge not so much.
Battered chicken balls - the type you get at a Chinese takeaway. The batter is always really soggy and the chicken is like a rubbery ball inside.
Mayonnaise - I used to like it until an advert years ago where they put LOADS of it in a sandwich and it all fell out the back of it. Made me feel sick and to this day put off.
Spam - what even is that rubbish
Chicken/beef/chicken and tomato 'sandwich spread' (those jars from the supermarket when you had packed lunch sandwiches)