It’s all about how serious you are with the game. People are toxic because they care in unhealthy manner. But just because they care isn’t bad. More serious environment helps grow, just like ranked is better for improvement than quick play, skrims are better than ranked. Quickplay is chaotic, ranked is less chaotic, skrims are sweaty and organized. Whatever people enjoy.
If you have good mindset, lost games can still be good. But they have to be good, close games, not stomps.