Noticed this thread and thought I'd add my own two cents. Unfortunately community servers are often under gatekeeping by the regular players, and most often with those with a high score or a lot of time invested on the server. I'll admit I am not innocent of this myself but it's mainly an immaturity thing. I haven't been
that toxic in years.
I find when trying to join a new community server to become a regular that you're often viewed as somewhat of a threat to lets say the "ecosystem" that's currently in place with the regulars - they want to keep everything as is basically. There's no better advice I can really give you other than to grind it out. It's probably not that you're bad at the game, its just that these regulars likely have a shitload more hours than you + experience with the map. You'll be shat on for a while, sure, but if you persist without giving them what they want: your rage/attention then not only will you get better at the game but you'll get to become that regular.
It's exactly how I started on community servers, including panda servers. They're literally sizing you up and seeing whether or not you'll give in or take the hits and push on. On a positive note, I don't think there's a better way to improve than to get beaten continuously, and you might be pleasantly surprised to find yourself rolling them after a while