Eh, might as well chip in.
As far as offenses go, ggez is pretty weaksauce. There are plenty of waaay more hurtful insults that need to be weeded out first: racial slurs, death threats, rape threats etc etc
BUT! (And that's a big but, think Irelia)
GGEZ is as unsportsmanlike as it can go. That's the equivalent of spitting at your opponents hand at the end of the match. This isn't trashtalk. Trashtalk is during or pre game. This isn't the funny kind of Trick2G disrespect to make your opponent tilt this is the kind of disrespect that makes the coach slap you behind the head and make you go back and apologise.
So IMO it should lead to chat restrictions and repeated offenses to banning. Cause, ggez hotshots, try to remember that at the end of every boxing/tennis/football game the opponents shake hands for a fucking reason, you incosiderate twats.