I don't get why this happens

I get into a lobby and the first thing i get is a player saying "I CANT SUPPORT CAUSE IM FUCKING DRUNK" and then he continues to spam the chat talking about how drunk he is. So i say " can someone please dodge im in my promos and need this win" which the entire team begins to just roast me about how toxic that was.

5 minutes into the game the drunk wukong top goes 0/8 to the enemy leesin. Leesin starts coming bot and starts killing our bot lane a bunch of times which was basically mine because thresh wasn't in the lane after the 3 minute mark because he said "i cant do anything with this cait she's garbage" i stay silent but around the twenty minute mark they say gg cait and i was only 0/4 at this point in time. So i say "maybe if you weren't roaming around in every lane except bot i would be doing a little better" and the entire team starts flaming me for ruining there good time by saying that. Like this community is so destroyed because of the domino effect that occurs it comes to blaming people. So after the lobby i just leave without saying a word and i get the you've been reported for verbal harassment pop up.

Flamers need to stop being so pathetic when people actually say something back to them.