Some people are simple and insult others at the table they are playing at. Very standard, but lacks creativity.
Some post messages on that persons PTR as a form of insulting.
Others try to insult them in these very forums by posting hands they butchered, etc to make themselves feel better.
Yesterday was a first.
I got an email from Ebay, I was like, that is odd, I haven't bought anything on their in a long long time. So I open it up:
Message from eBay member, nwerle
you are a ****ing moron
betting kk into trup qq
So insulting people on PTR and forums isn't for everyone. Some people take it to ebay!