I think that's not quite fair. Humans are social creatures. 2 years of life being put on hold was a lot to ask. I'm not suggesting we go crazy and start licking everyone's faces and forget to wash our hands etc, but from the millions of people going back to London and other cities that I've been to in and out of the uk, theres been a palpable joy from people.
I and certainly the broad professional network I'm part of have seriously struggled without being able to go to meetings, interact, meet up or go to events etc.. now I know it's not for everyone, but I'd say a majority proportion do.
If anything large gatherings now are probably safer than they were as most people are vaccinated, are more mindful about washing hands but even if not, oppressing human interaction is not going to ever succeed. It's not purely down to selfish behaviour, it's an innate part of both societal constructs but a core human trait.