Curious on how to Deal with Toxic irl Friends

This will feel a bit ranty, as I've wanted to get this off my chest for a while. Sorry if that's not your thing.

I have two close friends irl that are extremely toxic in game, and one who is not usually toxic but when he does flame it can be really bad. I am close friends with two, and one is the little brother of one of the two.

All three are much better at the game then I. To be fair, I started last season and they have been playing for three years. They are all around a plat level while my main is in low silver. (posting this on smurf for obvious reasons)

A = first friend, not usually toxic but can become extremely bad if he tilts B = always toxic, generally dick person who has made friends cry C= lil bro of A, likes to be hella toxic and claim he's 'trolling.'

We all voice call when we play, A does invite me often to norms. Those 3 are best friends and I am often forced to play with the less likeable B and C because of it. We all use voice comms and sometimes we will invite other friends to join us (most are around bronze-silver)

I usually play support with them. I'll generally have to support for B. He loves to flame me for every little mistake I make, even if it's not always my fault. He'll call me a 'retard' and a 'pussy' and loves to tell me that 'even though you're a girl you can't even play support lul'. Always tells me (and our other friends) that we're 'shit' and he can make super hurtful comments, both on call and in game. He has made friends cry.

C will jungle, and loves to make passive aggressive comments and laugh whenever I don't ult to save him or make perfect plays. He loves to repeatedly remind me that I am useless, that I only play with them because I want free elo and that I am simply a rock that they have to carry. I always express my frustration, but he will apologise usually after over pm and tell me that he's 'simply trolling.' Idm making jokes with him, at least he's better than B, he will apologise and can be constructive.

A is probably the closest out of all of them to me. He is also the best player out of our group, he's high plat/low diamond. He's generally chill, usually constructive but when he tilts all hell breaks loose. Since he is the closest to me, he hurts a lot more. He'll call me a retard, %%%%, useless, shit, worse that bronze etc. He did this to my best friend, who had to quit for two weeks because of it. He won't admit it's flame, either.

I am not good at this game, but I feel as if they expect me to be amazing. I am silver, not diamond. I'm going to make mistakes.

How do I deal with these toxic friends? I don't want to avoid playing with them, but is there a better way to deal? I usually have thick skin but with irl friends it hurts a lot more.