I was 22 back in 2012, at the time I wasn't at all interested in women but here are some of the changes I've noticed.
In the early 2010s it seemed like people were still fairly normal and that everything felt more grounded and realistic. People that were socially normal and didn't have issues dated people around their league. There have always been attractive and even hot women but the difference is you didn't see them taking pictures of themselves every single day and uploading it on social media to garner likes. Sure, there were some women that did this, but they weren't all that common. Online dating within this time period was a ghost town for the most part, as apps like tinder and bumble did not exist. You'd see a handful of women on there but the quality was always VERY low. It felt like in this time period people still met others in a more natural manner (social circle, shared interests/activities, etc.).
In 2020 things seem to be very different. Literally every single attractive woman I've met or know of posts tons of pictures of themselves on social media on a regular basis. What would have been something reserved for literally models and celebrities almost 10 years ago is now the norm for your typical hot or attractive girl that you'd see at the gym, bar, etc. They garner so much attention and validation, from both other women and thirsty men, that it has created this idea that these women are entitled to unicorn type men and that even a real world hot or attractive guy isn't even good enough. Apps like Tinder, which seemed to take off around 2015 or so, have changed the game in the same manner, where even an overweight and unattractive women is getting "matched" with a guy that is 6'+ and in shape.
I could list so many things I observe on a regular basis but I can say there is definitely a huge difference from 2012ish to now. Before the closings due to COVID-19 I was hanging out at a cafe with one of my friends and over heard this girl talking about how she can go to a bar and get any man to buy her a drink. The girl was a real life 4 and yet had this obnoxious attitude. 10 years ago a woman like this would be considered delusional and no men would even waste their time. Women's standards for attractiveness in men has definitely increased due to what I've mentioned here. Not that long ago I had a 4 make a comment about how I almost have a "dad bod", to put this into perspective she said this to a guy who is around 6'4" and currently 240ish who the other day did 15 dips with an extra 40lbs in weight lol.