Happened on EU1 15 minutes ago.
This guy was telling some pretty disgusting stories including somali pirates, genitals and more, and I told him that it is not cool. He than started targeting me with jokes to which I replied with jokes too.
After someone told him that he was not funny, we spawned into next round and he started attacking me, I barely had time to pressed M 3 times and than he backed away, leaving my horse nearly dead on start of the round.