How true. I mean just because someone says 'napkin' or whatever doesn't mean they are not a total cunt does it?
No, but no one is saying that. It has nothing to do with niceness, human worth, the kind of good manners whose base is making other people feel at ease etc. People are just saying that certain words like 'pardon' are social class markers still in 2016, and that in a society that is still pretty class-bound (which yes, is appalling!), certain situations which could be social or professional (as in the article about the City quoted by a pp) not knowing dress rules, saying 'pardon' or 'ever so' or 'serviette' or 'lounge', looking blank/saying 'Fine,thanks!' when someone says 'How do you do?' or holding your knife like a pen are going to mark you out as 'other' and potentially cause a barrier in some lines of work.
I mean, wouldn't you rather know if you or your adult child kept failing to get a certain type of job because you were literally speaking the wrong 'language' and it was easier to hire someone who was reassuringly familiar to, say, an old money clientele? Sure some firms will say 'This young person is talented and we are prepared to train them socially', but others will take an equally-qualified candidate who already speaks the right language.
And no, it definitely isn't regional. Of course you may have been taught that it was polite to say 'pardon' when you didn't hear someone, as many people have said - if you were being taught by a middle-middle, lower-middle, or aspirational working-class teacher/parent! I certainly was.
www.lady.co.uk/people/8352-pardon-that-s-practically-a-swear-word
This article (in the always hilarious The Lady) quotes Jilly Cooper as saying that 'toilet' is 'creeping upwards' because apparently everyone's poor now and sends their children to state school, where they learn non-U terms you can't then eradicate at home...