I keep noticing people in PvP who are completely rude to others.

I've seen tons of people tell others they shouldn't even be in PvP because of their gear.
Now I fully understand that sentiment in dungeons (gear is tiered so if you get i50/55 af and try to do pharos you are wasting people's time), but this is pvp. It's a short couple-minute match. If people are new to it, it should be just fine to have new gear.

I also see lots of people telling other people they are horrible (including myself). If I don't wake someone up when they are slept then i'm the "worst healer ever," even if i'm being stunned and trying to keep a bunch of dd's alive.
If a dd gets killed in a few hits they are a terrible DD, regardless of what anyone else did.

This is a game meant to be fun. You aren't getting any super magical awards from it. So why not just be nice to people? Thank them for trying, point out how they could do better, etc.

But there is honestly no reason to be a jerk, or to try to blame specific people for losses.

Just be nice to people and have fun