One Halloween as a kid we got gummy false teeth. It looked exactly like how you think it would look. I cant actually remember how it tasted, but it want good. Second was some sugar free sour patch kid clones, they mostly tasted like soap.

Black Death. Tastes like I’d expect a chemical burn to taste.

American candy. Not American brand candy which different outside the US, but actuall American candy. It's all so bad quality and vile that it would never sell outside the US and not even be legal to do so in many places.

I tried some matcha mochi once. It didn't really taste good, but the worst thing about it was that it was just boring.

Well, licorice is definitely up there.

There's some pralines that with some alcohol based filling that's also really gross.

But I still remember I was a kid and my parents bought these cheese crackers. They were awful, the it was a bit crumbly but they had this really bad taste of something I can only describe as for fungus & cream cheese. I literally had to take a break and concentrate on not barfing even though we just wanted to play tabletop games. I know it's not sweet but that stuff lives rent-free in my head to this day.

Black licorice is just horrific. I try it every once in a while as I age thinking "Old people like this, maybe I'm old enough to like it myself, now", but no. It's still an instant headache/nausea combo at one taste. Ugh.

If I had to choose between leather belt flavoured licorice and vomit flavoured Hershey's. Licorice wins everytime.

There is this brittle thing of foam everyone likes to make into weird shapes like little birds... I don't know what it is called and I don't want too

Maryjanes? (Very old yucky candy, not cannabis related)