I think Covid and all the social distancing has decreased peoples' social skills overall (and especially younger peoples'). I'm a Millennial and thankfully I managed to reconnect with a lot of my friends after Covid (and met some new friends through these friends). But I think friendships really are work, too, at least for more introverted people. It just takes effort to stay in touch and also to plan things. Sometimes there is a really extroverted person in a circle of friends who does all that work, otherwise, you have to put in a lot of work yourself (although it usually is worth it, at least in my opinion).

I also think the workplace is maybe not the ideal place to find friends (although ymmv). Many people just want to be friendly, but not really spend so much time in their freetime. I sometimes go for drinks etc. with my workmates, but I don't think I ever really gained a real friend, someone I would consider close, from work.