Gold+ players would surely understand this...
"You are so bad"
"Looked up your stats, they are shit, don't main (example role)
"Stop it XYZ player"
"YOU ARE BAD" (would repeat this sentence and go out of his way to make his point)
"You dying like this really demotivates me, don't do that again"
"Oh X lane lost?, i give up, lets surrender"
"We can't win, just surrender"
"I don't care about this game, just surrender"
How do you deal with such people? I mean, muting them is not always the solution, plus your teammates just can't find the reason to mute the toxic player who is distracting them from focusing on the game and winning.
Almost every game i get such players, there must be some solution...