I personally have never really have a problem with this sort of thing, however, I did once have a stranger person come into my public room while I was in the middle of a roleplay, and make very very vague but ominous threats, something about belonging to some big, bad family, and how I had somehow slighted one of them... I handled it politely, waited for him to leave, then blocked him and everyone I could find that was associated with him. It was a little jarring, my account is incredibly dear to me.