I feel like people who say "GGWP" when they win are just complimenting themselves
This sounds ridiculous, but hear me out.
I've always thought GGWP as, "You played well, but I played even better than you. :)"
For whatever reason, to me, it's more offensive than saying "GGEZ" because it's a much more passive aggressive way of BM'ing the enemy team.
I only say GGWP now if I lose for these exact reasons.
I have no idea why I feel this way, but it never fails to piss me off whenever someone does this.