Unfortunately my advice is what you're undoubtedly doing: block, report, mute, ignore, as necessary. If things are really bad you can consider reporting them to the police, though I've never bothered with that.

If you find yourself wondering whether something's OK or your perceptions have been warped by the internet (happens to us all,) then run the message by a friend or family member - especially one who doesn't have a public-type account. Most of the time I've found it's worse than I thought, and I'm not over-reacting like I thought I was.

Some people suck, take care <3