"GG EZ"

I seriously don't understand why people say "Gg ez" at the end of a game of League. There's seriously no point except to show people you're a bad sport. Especially if you were the one that was being carried and didn't participate much at all in fights and whatnot. It just irks me way more than it should, especially if a game could've gone either way or when you have a D/C on your team, seriously decreasing your chance to win the game. People that say "gg ez" while it may be a joke could seriously annoy someone even more that was possibly tilted from the game and I feel as if not many people report it even though it easily comes under Bad Sportsmanship. :/