Why are golds and plats so braindead??

I’m playing ranked (I’m gold) and i queue against a plat lvl 100 queen nai spammer. He runs away the whole game then obviously loses, then the rematch, and after losing that he invites to lobby. He then proceeds to pick the biggest maps and play passive for 15 FUCKING GAMES. He sat there and ran away for five minutes a game just to lose 15 FUCKING TIMES‼️I beat him every time JUST to see how long he would do it and ended up leaving. He thumbed down after every game I need a genuine psychological reason why I’m playing against so many people like this it’s like some stupid fucking joke that everyone but me knows about