I have a boomer-ish pet peeve.
I hate it when someone don't greet or introduce themselves when entering a new place
I get it you're an introvert. I don't expect you to interact with me everytime. I'm an introvert as well. But at least greet once when you're introducing yourself. And That's it. That's the minimum fkin requirements. I see this everytime whenever I have to enter a new department and some students don't do it. I get it. It's overwhelming. I did too in the past and it's why I make a point not to do it.
My brother's girlfriend came over yesterday and she's been in the room ever since. I never saw her once. Never introduce herself no greeting. God I hope she's not the type that locks herself up in the room until she need something only then she comes out.
I've had a few cousins like that.