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I'd agree things have got faster and I'm not sure why so many need to dash around. I'd also agree that the older generation does deserve respect, but then so does everyone (including the younger generation) So often I hold the door for the older generation (and for some reason it always seems to be M&S) and am ignored, with no smile, no thankyou. The thing is these people are not in a rush so there is no excuse, these things work two ways.
As for speech, language changes, evolves, sometimes into things we do not personally like, it's interesting how you have spelt 'generalize' don't you think? Towns centres and trends also evolve, it's just a shame conservative types resist change (but not spell check), causing stagnation.
Just to add, I say 'see you later' and 'ok mate' but do not see this as being lazy! I personally find your lack of punctuation and 'lazy writing' more offensive.