Standards can only slip if here is an absolute benchmark from which they can slip, and who gets to decide what that should be?
As I said upthread, there was a time when not wearing a hat outdoors, or wearing the wrong gloves for the time of year was seen as letting standards slip, but I doubt if any young people (or even people of my own age) would even notice now. I am 63, and in my lifetime many things have changed. Hanging out washing on a Sunday, touching up a dab of face powder in public, women going to the bar to buy a drink - many things like that were considered beyond the pale when I was a child, but now you see people applying full make-up on trains and buses, women expect to pay their way, and most people see Sunday as time to relax or do the things that can't get done in the working week. Even churchgoers are happy to go to the shops or catch up with chores, and nobody would gossip about them, (would they?)
My grandmother's generation would judge one another (well, women anyway - men escaped a lot of this social control) by the condition of their doorstep and nets, and anyone without washing out before 9.00am was 'letting standards slip'. Do we really want to go back to that? I think we have become less bothered by 'what the neighbours think', and I see that as a good thing.