When you say "ggez", you're are legitimately being an A-hole.
Edit: It was recently made clear to me that the title says "you're are". That's autocorrect for you. Ignore it.
"Gg" means "good game". By that, you're saying that everyone played well and it was a good match.
"Ez" means "easy". By that, you're implying that you stomped them, they did terribly, and it was easy for you to win the match because of how terrible they did.
"You did well" and "you did horribly" aren't the same thing at all.
So when you say "ggez" you're saying:
"Good game, everyone played well! SIKE! Y'all are horrible and I stomped your asses."
So pick one, gg, or ez, because whenever you say "ggez" you're just being a smug bastard.
or if there's someone who's been trying to pop off with mastery flashing. and even then i usually talk with them in post-game if they stay, and wish them a good day/better luck next game/what have you. sometimes i give them advice on how to fight w/e champion I play as. i could not make it more clear that i talk shit just for the sake of talking shit (because it's fun, and I encourage anyone who meets me in game to talk shit to me) and I don't ever make personal insults or death wishes, no slurs.
does well, win or loss, I say "GG, Ez"
Else, I say "GG"