My mother cleans schools for a living, and she once remarked to me that most of the teaching staff in the grammar schools[1] she cleaned would avoid making conversation with the cleaners, and some would even avoid making eye contact, which was contrary to non-selective schools, where most of the teaching staff would make conversation with the cleaners.

[1] Grammar schools are academically-selective, state-funded schools in the UK and elsewhere—staff and students alike are generally of a higher socioeconomic milieu than in non-selective, state-funded schools.