I work in a call centre and for the most part, I love my job. I enjoying helping people when they need me most. But. A lot of people don't even say hello. I don't expect how are you etc, but a simple hello is nice! Most people are relatively polite but a lot don't say please or thank you either and it really pisses me off at times. I would never dream of not saying please or thank you. Do you say please and thank you etc and if not, why not?
Yabu - get on with it and do your job.
Yanbu - people are pricks and have no manners.