Oh god, where do I start...
Anything that takes chocolate and ruins it is sacrilege to me, so Almond Joy/Mounds, Whoppers, and whatever mint chocolate candy can all die.
Aside from that, I'm also not fond of licorice or Twizzlers, I could swear those just taste like plastic.
I don't like a lot of hard or chewy/gummy candy like Jolly Ranchers or Fruit by the Foot/Tootsie Rolls/Haribo or Gummy Worms (...unless it's specifically sour gummy candy, I like the texture on the sour ones), but I also don't mind their existing unlike the two above.
I used to love Candy Corn when I was younger, and always got really mad at people who didn't like it, but now that I'm older, I can't tolerate it as much lol, it just tastes like straight sugar, and they make my teeth hurt after eating like 2 of them, so I understand the people who don't like it now