I've come to not expect manners from the public.
I remember my first job working in a cafe, and after a few month I was completely thrown when a customer actually said please when placing their order, it hadn't occurred to me up to that point how rarely people say please and thankyou - most (certainly not all) just demand and expect.

Nowadays I'm getting used to the rudeness of people, not just the lack of basic manners , but occasional full on the abuse I get just for doing my job.