Forgive my vulgarity, but this is a post about language and we can’t be afraid to use real words. Keep in mind they are all in the dictionary. If you guessed fuck, cock, tits, twat, shit, or cunt among others, you scored well.
No matter what word you fill in the blank, there will always be people saying negative, threatening, ignorant things to another, so to focus on specific words is pointless. There’s nothing inherently evil above any one word -- only about how it’s applied and the intention of the use behind it.