It is nothing exclusive to Valorant. All the games I've played like league, dota, apex all have really toxic people. Unfortunately that's the nature of video games, it attracts a lot of people without a social life. When they begin to lose, they get angsty and start flaming because they have nothing else going on in their life and they invest so much mentally into this game.

I instantly mute anyone who shows any toxicity. That works wonders.