WELP! Late Game Throws New Meta?

I don't know if matchmaking is just flawed, or if I'm just the most unluckiest ever, but am I the only one who always has teams throwing? My team just threw back-to-back games, one which was a 5v4. It's the new meta now for me. Of my 89 losses, at least 30 of them are throws. I always get teammates who act dumb late game. You ping retreat and they engage anyway into a 2v4 or something. You get a Master Yi ulting down mid lane into 4 enemies thinking he can kill all of them. Is this the new meta? And it seems like the enemy never does this for me. It seems like my enemies never throw, yet my teams do. Any tips on how to stop a team from throwing? I've gone from saying, "Please don't throw," to typing in all caps, "STOP THROWING AND FOCUS", to spamming fall back pings, yet teammates still act dumb and throw the game. Anyone else feel the same way? How can I improve on stopping the "new meta" from coming into effect every game?