As a person who at the moment is doing an experiment to see how to help people like you (I purposely calibrated in 1.4k mmr to try it.), I must say there's many annoying people in all mmr brackets, so don't think low mmr is the only bracket full of douchebags.

Yet, one thing I can see in this bracket (I don't know if I'll see it in the 2k bracket) is that there's a lot of toxicity. People blame their teammates for a bad play and that makes said teammates feel worse and start feeding. It starts a psychological chain that I've seen have thrown the game in many occasions.

The easiest way to overcome this is to mute them all, play as if the outcome didn't matter and you're just okay with how you did it, that way you will be able to look closer at your mistakes instead of being angry and unfocused when you try to identify em, which won't be possible because you'd think you did everything right.

The hard way is to talk to your team, prepare to be annoyed and deal with the toxicity with a level head, which gets old after a while. I consider myself a tolerant person, as I've been told so by other people, and I can't deal with it. I sometimes even end up angry if I've had a bad day.

So yeah, approach as you want to but you should try to look at your mistakes, maybe even watch some replays to see what you might have done wrong.

Now, it's easier said than done and I might say, I have it easier. Since I've sung for a long time, I'm always conscious about what I do and that helps a lot. At the moment I'm trying to make a guide about how playing each instrument can help you in Dota, so that might just be me.

Anyways, I hope I've helped and glhf!