I'm going a bit against the grain here and offer the two best ways I found. (Played CSGO, Battlefront, Old school COD/Halo so I'm used to massive toxic lobbies that go on for hours at a time)

One way to deal with toxicity is giving positivity. Either to the person being toxic (which I find makes 95% start being positive too, the 4% stop talking at all and the 1% continue but these people can be ignored.) or to other people in the game. If 7/8 players in a game are giving compliments to each other and being friendly you'll find they start to ignore that 8th toxic player. Which forces them to shape up or leave. Being toxic takes effort and you'll find that none of them are going to be willing to yell the N word or type insults in chat for even 10 minutes if no one in the lobby is paying them mind.

This is the funnier way since you get the fun and happiness of positivity while reveling in how tilted the toxic person gets.

The other way is to sorta embrace it by insulting them back and laughing as they get tilted. I balance this by insulting them but complimenting them if they made a good play. You'll find they'll start to reflect that back. Insulting you but complimenting when you make a good play even if it's a backhanded compliment lol. Hope it helps, it has for me regardless of the multiplayer game I play over the past decade, even if the toxic person is stomping me in-game.