A lot of these have sources that actively contradict the claim, or are technically correct on the most redditor-esque of ways?

Banana-flavored candy was not intended to mimic the taste of a formerly popular variety of banana. It tastes different from bananas because it is mainly flavored with only one of the many flavor compounds a banana has, isoamyl acetate

Links to this article.

Remember how isoamyl acetate is the chemical compound primarily responsible for banana flavoring? Gros Michel contains more of that compound than the Cavendish. In fact, isoamyl acetate was one of the first chemical compounds used in artificial flavors that was confirmed to exist in the actual fruit as well. So, when you’re biting into a piece of banana Laffy Taffy, you’re getting a taste of the bananas of the past.

Or

It is not illegal in the US to shout "fire" in a crowded theater.

Knowingly false statements of fact are often constitutionally unprotected — consider, for instance, libel, fraud, perjury, and false light invasion of privacy. That would presumably apply to knowing falsehoods that cause a panic.