These threads always seem to be really superficial - the sum whole of art and culture seems to be entirely focused on ‘clothing style changes adopted by everyone, and network TV shows, and radio music?’. They seem to ignore huge chunks of culture, like who even gets to be shown on those network TV shows or how people consume art and media - the move from listening to radio and buying whole albums from major publishers (which were often listened to front to back) to highly customizable streaming services and downloads, or the move from watching TV on a major network when they aired it to streaming and DVRing stuff whenever you want it is pretty significant. Or how people interact with each other - the process of going out to a movie or going out to dinner/drinks with a few friends was radically different from what it was back in the 80s in the 2010s, as was hooking up, dating, and marriage, and 2020 has completely upended social interaction. And specific clothing changes always seem to get ‘special-cased’ out of existence - face masks in crowds is a huge marker of whether a picture was shot pre-2020 or post, but I doubt that is going to count.
Take a look at one narrow case: how gays are treated in popular culture. In 1980, gay culture was mostly underground and gays were mostly considered the butt (hurr hurr) of jokes, SSM wasn’t even taken seriously, and gays outside of big cities generally had to live in the closet. By the 1990s, SSM started to become talked about as a political issue (only 27% support nationwide) and gays had some level of acceptance. While many popular shows (Friends) tended to treat gays as ‘around, but kind of uncomfortable’, other shows actually showed gay weddings occuring (Northern Exposure and Roseanne). IKEA ran an ad with a gay couple in 1994 and got death threats, Subaru marketed to lesbians but only in a ‘wink and nod’ way. By the turn of the millennium, you could have a gay person as a star on a network series (Will and Grace) and a show specifically about a bunch of gay people (Queer Eye for the Straight Guy). By 2015, SSM was legalized across the US, and support for it had gone up to 67%. While today network TV is not as important as it was in the 80s, non-straight charactes are not rare even there, and are even more common in other media (cable TV, pay cable, streaming services, movies, and more), and it’s not treated as particularly noteworthy. The mainstream wedding industry is fully onboard with selling cakes, dresses, tuxes, and all of the rest to weddings even when there are two brides or two grooms.
There’s simply no way you could air a comedy on network TV in the 80s about a police precinct with a gay police chief as an incidental feature of the character, and casually run jokes about he and his husband’s issues the same way you would a straight married couple. But Brooklyn 99 ran for several years on Fox, then moved to NBC when Fox decided to cancel it after multiple seasons. And there’s no way Cheerios, Nabisco, Amazon or VISA would have run commercials featuring same-sex couples back in the 80s (Amazon didn’t even exist then) - but they do now. If a cable network declined to run same-sex-couple ads in the 90s it wouldn’t even be noteworthy, but Halmark declining to run one in 2019 got them a lot of heat.
I honestly have no idea how someone can look at just that narrow bit of massive change over the last 40 years and say that there’s nothing new going on, much less all of the other changes.