Another funny thing is that while people who use actual hacks (that are actually caught) are only slapped on the wrist, it is well known SE will perma ban people for being "mean" all the time, especially before the chat ban when players could actually talk to each other......

But it is like Yoshida says, they really only have chat logs to go off of so it's easier for them to ban mean players with permas than hackers/boosters/cheaters with even a temp ban and a rating wipe.