YANBU - tbh I think there is a general decline in manners full stop.
I work hard to instill p's and q's in my kids, but then they hang around with some children, who at the ages of 3 and 4 really should still be somewhat controllable by their parents (iykwim??) and their manners are ATROCIOUS! and then they copy them. sigh.
It irritates me that I will prompt the kids to say thank you if they forget (they ARE only 3 and 4!!) and the person will say no no thats fine. No, it isnt. they SHOULD say thank you, so just accept that I am trying to teach them the right thing cos in 10 yrs time you would turn around and say oh! what ungrateful children!!
Also, something I got from the church we used to go to, and that I reallty think teaches a bit of respect is the calling all adults by Miss or sir. DS's teacher wwas called Emma, for eg, and we always made him say Miss Emma and I really think she appreciated it, certainly she mentioned what a polite boy he was. It is not about not being 'friends' or whatever with your students, or 'accessable' toyour students or whatever reason it is that they no longer call them miss/mrs.sir in school, it is about respect for your elders.
But then look at the decline generally of respect for elders and authority these days. There was a time we wouldnt DREAM of calling our teachers by their first name.
There is a whole debate about how society used to be adult led, seen and not heard and all that and now it has turned to child led, which is good on some ways, i suppose, but has it gone to far? WRT to entitlement generation y etc etc?
OOPS, sorry, have gone on a total tangent, but hopefully someone gets what I mean.
It is all about respect for others and politeness!!