Early days for us. Some people friendly, some friendly only if they want something (eg their DC needs to make friends, they need info on school choices), some aloof, some unfriendly (eg in a circle having conversation, will keep backs turned to someone on their own stood next to them, reading in car every day rather than chatting unless they see someone they know, not saying hello)
Some I never see cos of their / my working patterns.
Our childminder does pick-ups often, no-one speaks to her and she's had a couple of awkward incidents, dislikes doing pick-up.
Lots of awful, inconsiderate parking and no apologies, eg for boxing you in, making it impossible to get to / fromschool gates with buggy.
Tbh, it's one of my main reservations about continuing with independent education, eg likely that the parents' attitudes (eg "I am more important than all of you") will rub off on their DC.
But IME the nearby "outstanding" tiny catchment primary seems just as bad, with added tensions due to people stressing about getting in / where to go next.