Yea I mostly agree. For example not greeting cleaning lady has nothing to do with being rich or poor. It is just manners and some of us do it and some don't.
Today the cleaning person works for an agency, is a different person every night and has 4 hours to do 8 hours worth of work.
Do others greet every single person they see in the building?
Would I say hi to the landscaper who is working on the garden while I was walking on the path? No. Unless we know each other, a nod is all fine.
Yes I always did. Would get into some long chats with one of the cleaning ladies actually. And if someone came into my office to do maintenance on the aircon unit I'd of course greet them.
I say hello to the cleaning staff, security staff, delivery drivers, food service workers, etc at work. I can't get my job done unless they're there, and I am acutely aware that our professional experience and treatment by management is significantly different.
the parents were invited to the school to meet the faculty and the parents who were college educated or those went to the same type of schools understood the song and dance - the mingling with the adminstrative staff, the dean of students, the professors and lecturers - and the parents who were not educated or were part of the lower class didn't know what to do, so they hung out with the cafeteria staff, asked the cafeteria staff to take care of their kids. those were the people their families and relatives knew and understood.
and the first gen students also understood that they belonged to the same social strata as the cafeteria staff, and things like office hours or asking for help from the professors or the TAs were something that they could not possibly be entitled to.