Option to full mute a player

Had a guy named Xêen in my raid team, he started flaming at the first death of the raid, then doing forfeit votes for no reason for 20 mins straight and pinging on the map constantly.
He was a proper nightmare and there’s nothing you can do but leaving the raid.
Why do toxic people have to win in such situations when an entire raid party is just chilling and trying their best ?
We need full mute option.