Must say that has never occurred to me. Certainly not in connection with you, OP.
What has occurred to me, though, is that some people just really enjoy having a safe, anonymous, rather nasty go at other people. I think you get a few on most forums, though the worst I've known is a largely male one.
I often see them as the sort of people who'd never dare (or dream of) saying such things to a person's face.
Could be wrong, though! I have an aunt who prides herself on 'speaking her mind' - no matter how hurtful or upsetting that may be. And I dare say there are plenty like her.