Trash talking the other team never bothers me. Trash talking your own teammate is just pathetic.
There are certain players who spend more effort trying to blame the possible loss on their teammate as soon as the match begins, rather than just trying to win.
I don't care if it's me, or the people on the other team. Blaming your teammate every chance you get is lame. Especially since the matchmaking in Rocket League is good and that person is the same rank as you for a reason.