It's been awhile since following the Overwatch forum, but is saying "GG EZ" in match chat after a win considered toxic in the community?
I know at one point it was frowned upon, but I don't think people went as far as saying it was toxic behavior. Its just expressing good game, easy, like the match was easy.
Every time someone says that to my team after we lose, i just say gg back and thats it. Often times I will admit, it was pretty easy for them because we didn't put up a good defense at all.