One of the reasons I'll quit a game while in the game lobby is because of a raider in my team, who's toxic. As the title suggests, is it possible to create a block mechanic, to filter out players in matchmaking you don't want to play with. There's nothing worse than having players messaging you, spewing vitriol, only to find them in your team in the future. You really don't want to help these people, let alone play with.
Moreso, this game mechanic, if implemented properly, would 'clean up' the gaming community. Toxic players will find themselves being blocked so many times, eventually, the only games they'll be playing will be the solos.