Is it me, or is one for all full of tryhards?

Let me get this out real quick, I'm not saying that "omg these peeple such tryhurds playing taric in 1 for all. i deserve challenjour gg" It seems that %40 of the people I play with think this is ranked or something, and that if they don't win, then Ronald McDonald is going to come to their house and steal all their toasters or some shit, I don't really know what goes through their heads. They always try to get the best possible champions, and they trash talk A LOT. For example, I just got out of a game of Gangplank vs. Darius. This one guy would not shut up about how "this was a bad pick" and that "gp is trash". I'm sorry, but WHAT? Gangplank is very arguably the best designed champion in the game. He heavily rewards skill and also has decent amount of counterplay. I treid telling him that, and he just said "shhhhhh ur only bronze". That was arguably his most well thought out insult. Over the course of the entire game, he found it necessary to say "LOL BRONZE KID SO BAD" every time I got pulled into a group of 5 Dariuses, and later, when I asked him why he thinks I'm a bad player/Gangplank is a bad champion. His well thought out, articulate response? Verbatim: "u suck"

Why is 1 for all full of kids who think that this is a half serious game mode? Seriously, just play bard, ignore the other team, and just run around collecting chimes saying you're a Pokemon trainer