Just dodge/ban if you are against your teammate playing Tryndamere.

It's gotten to the point where I have to '/fullmute all' every game because I got 4 people yelling at me the entire time over all sorts of shit. Low elo players keep talking so much shit thinking it's about the KDA yet they sit mid and do nothing or run it down while I'm getting to their nexus, being told I'm "useless" for trying to win the game.

Ban or dodge if you don't want someone playing Tryn, otherwise stfu you're throwing insults and being incredibly rude only to get yourself banned for toxic behavior. This type of thing only happens when I play Tryn.