I've been there several times and have never noticed the issue you describe.

How would you clean it up? It's the internet there are trolls everywhere. Ban usernames? They don't have to use a steemit ID if fact chat wouldn't let me use mine because of the - I was forced to change it. Ban IP of the offender? They just hop on the next VP or reboot their router if they have dynamic IP. Best way to deal with them is to ignore them and they will move on to where they are getting attention. In fact a thread like this just plays right into their hands.