He has a " " (space) at the beginning of his nickname I used to
play with another guy named Snowman on the GS servers 7 years ago.
If I joined after him on the server I would have a "2" at the end of my
nickname. I remember some GS admin (I think Barney) wanted to
ban me one day because I was using the same nickname.
From your screenshots I didn't see him insulting you. You were insulting
and killing him.
... and from your screenshots he just disconnected, but not when killed
by the enemy, only by you