Hmmmm. I think what is happening here is that you are going through the 'everything is annoying' phase of middle age. I am of a similar age to you, and have been through it myself.
Poor grammar and lazy speech used to have me seething. Now I just roll my eyes.
What saddens me is the ease at which we surrender our English culture to the onslaught from 'international English' and manners.It's almost as if we should like to be anything but British. By this I don't mean clinging to things like Imperial measures and currencies etc (Sorry FR), just our funny little ways

Here are a few more niggles to add fuel to the fire:
Using nouns as verbs.
Eating with a fork in the right hand. Fine in the privacy of your own home though but not in public is it?

Over familiarity of shop staff. I don't really want to discuss my weekend plans with a cashier I have never spoken to before, regardless of their social standing and education. I am sure they are all lovely people but it is too over familiar for the likes of this old public schoolboy.Give them the cane or beast them, that's what I say

Anyway, my advice to you is just relax about it bloke. You wouldn't expect us to be talking in the same manner as they did two or three hundred years ago, and the reason is that language evolves whether we like it or not. So maybe it's OK really...
Can't wait for the religious rant

Have a nice day now.