Consider yourself lucky, then. Because I know first hand it has nothing to do with "being bad at the game"; people will take ANY reason to harass others.
Feminine name? "omg a grill" Yes, with that exact typo.
Speak up in text chat? Get called sexist obscenities.
Speak up in voice chat? A matter of time before some guy jumps on the chance to harass you.
Don't speak up in voice chat? You're suddenly "a guy playing a girl" or worse.
Call someone out in chat? Prepared to get call the b-word.
Don't call someone out? You'll still get called that indirectly anyhow.
It goes on-and-on....
These are all different cases from 2016 to 2018, and they're just what I did manage to screenshot. I wasn't able to record the voice chat harassment.
Safe to say, it's bad. It can be almost a game to game occurrence. It's frequently unprovoked. And if you don't have multiple people standing with you to fight back, then it WILL get worse. :\