@mailTo
You didn't mention barriers, you spoke about "different worlds". I wasn't disingenuous.
Correct, I didn't mention barriers, you did. Maybe you were just inaccurate, not disingenuous 
You, amongst others, seem to hold arbitrary rules of good manners as sacrosanct and that an understanding of what's "proper" is all so important.
Not true, I merely said that it can be a way of respecting others as it is not pleasant (for example) to see the food in someone's mouth while they're eating.
You cherish compliments on children's manners and look down on those without the understanding you have.
Not true, I didn't mention compliments nor children at all.
*"I just said it can be handy to know things even if you don't want to put them into practice in your own life"
Yes. Aspirational.*
This was in reference to how I got a great p/t job as a teenager doing silver-service waitressing. Hardly aspirational.
I think that good manners, perfect manners, are about nothing other than making others feel at ease. Maybe waiters and waitresses clearing a table (elbows in and cutlery at 6-12) or whatever else.
Eh yes, that is what I said (waitressing)
@Panicmode1
If these are the compliments you're waiting on then you need better friends or a hobb
I didn't ask for compliments! I've lots of good friends thanks, no hobb though. Is it cos of my manners d'you think?