They call 'em 'greifers' ..people who log into a game just to see how 'bad' they can be and get away with it.
I've heard all the excuses many times.. 'it's just a game' I would guess is the number one excuse.
The fact is .. how you present yourself will determine how you are treated, 'in-game' or in meatspace (real life for those who don't get that reference

People who want to be thought of as total jerks, uneducated, who cannot control their mouth much less anything else by all means can wade in and do their worst.
When I bother to take notice of them at all . . I usually ask 'em ..'do you enjoy playing this game?' .. because usually ..there is a way to get rid of them.. permanently.
All it takes is a little time .. any game I have ever played there has always been a way to ban an account.
-evil grin- ..The thing about those folks is .. they are invariably easy to setup for banning. They never know when to stop.
(I had one jerk lewdly proposition my wife in EQ ..with a GM standing right behind her ..it was .. er .. ok .. hilarious
-GE