How to deal with trolls -_-

Hi Y'all, So recently I got a gangplank support last game in ranked, and when asked many times why, he simply said that he was at 0 LP and didn't care. Reported to Riot and everything but most of us know that some times riot doesn't do anything about these so called "off-meta" roles. My question is How do you deal with players who simply want to make a negative experience for others? I've already ignored them in every way, but it's just the mere fact of knowing you're gonna lose from someone who wants to lose, Help plz
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