The League Community is so toxic

Every time I play a normal game. I get harrassed for being shit because i lose against a tryhard gold 5 that has 1000 games on brand in ranked, because I'm trying to learn how to play a new champion that isn't strong as fuck in the current meta.

apparently now im supposed to spam leblanc because shes the only mid laner i can destroy anyone with. If I try to play anyone else, I will lose which is ridiculous! because 'I'm plat im always supposed to win and do well'

the only thing i've learned from this community is to '/mute all' before each game starts so i don't have to get harrassed.