So this joe.public character seem to be suggesting that you are an "abuser" of some sort without offering specifics. This sounds like an (unsubstantiated) opinion to me.

They think you're an abuser and you think they're an abuser, but you've got a bigger fist, so you just pound them into submission.

The duplicated posts seems like someone shouting in the street. I'm sure if they could afford an official banner ad, they'd use that instead.

I'm just not sure this has caused you any harm personally.

Plus, all of their posts and comments are already AUTOMATICALLY hidden (-3)!

So basically you're beating a dead horse at this point.