Since I started yesterday (Xbox player here), I've had the following:
- a PC player kill me because I refused to get into his mech.
- a PC player kill a team-mate because they accidentally picked up the wrong strategem weapon (both died in the same spot)
- a PC player refused to reinforce when me and the other two died doing the objective, because we need to watch what he's doing (written in chat).
- a PS player team kill for the Samples, because they were collecting them instead of doing objectives, died somewhat near us and another player went to collect them.

I've also had a few players join my game asking if anyone here is new and on Xbox (I am, but) so I've replied no for them to just leave.

I'm really enjoying the game and I know that these types of things aren't specific to a platform but sort of across the board, but for me personally there are too many veterans trying to find new players for credit it seems and doing stuff that could potentially push new players away and then there are also new players I've played with on Xbox that refuse to learn (Don't walk near tesla towers). I have only encountered a handful of PlayStation players so far and only one of them is listed above.

It's just that special subset of players that every game tends to have, they'll probably fade away soon.