Wearing trainers without socks in summer: lots of people did in the 80s and 90s, but I think far more people wear invisible socks nowadays. (I'm old school, though: I go sockless in trainers in the summer.)
Re. the Jeremy Kyle show: in one of the Adrian Mole books, Pandora makes this comment when she is an MP: "I adore the show. I lets me keep in touch with the underclass, without having to visit their dreadful estates." The sort of thing that Johnson or Sunak would say out loud.
Certainly the Covid crap. The way they blatantly normalised it all with the phrase "new normal", and deliberately terrified the pants off the public, in their own words. Now we need to keep up the resistance to make sure it never happens again. People are slowly coming round to how they were terrorised by their own government. Partygate showed it for the nonsense that it was, and I have a nasty feeling that if Partygate hadn't happened, people would still be craving restrictions, and the government would still be dropping hints about future ones. (Was Partygate orchestrated, and poor ickle Boris used as the whipping boy, so that people don't crave future lockdowns, once somebody realised they were an economic disaster? It's government logic, it wouldn't surprise me.)
Also, related to this, I think there's now more public distrust of politicians and the media; until recently, many people trusted both implicitly. It can only be a good thing if this changes, and people become much more sceptical. Social media means that mainstream media is not the only source of information. Yes, that is a very mixed blessing, but anything which makes the public sceptical is a good thing as far as I am concerned. People don't seem excited about a possible Labour government now, unlike in 1997, when Tony Blair was promising total fairness and the moon on a stick, and people believed him. There's now a feeling of "we've seen it all before".