What can I do about unscrupulous (rude, selfish, stupid...) players in ranked pre-game waiting room

Ok. This is not the first time. You must know that feeling when you come to waiting room before game, you got some role and somebody tells you, like "you are not that role, I am swapping with you, deal with it" and he is picking before you. This insolence drives me crazy and lately, I rather leave right there, because games with such people tend to not be enjoyable. Thing is, if I don't play game with this person, I cannot report him and thus maybe save others from dealing with him. If I play with him just for way to report him, I have no pleasure from such game. What should I do? I gave you example, but this topic can be widened to all sorts of insolent people and contact with them in pre-game waiting room.

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