I don't think anyone is saying people in their early 20s are all that much different, though some are. It's the kids who are like 18 and under now mostly who grew up entirely on social media platforms that are starting to get weirder. I can deep dive this if you care to argue with me over it but I don't think it's a controversial take to say kids are more awkward now around people and in social settings than ever before and I've experienced it first hand with family members, other people's kids, etc.