My friend sends me a photo of some people drinking. "Do you know anyone here?" I said no, I did not. Then I recognised one of whom I'd met before ... and then we talked about that person. "Probably would not find me very amusing, playing with laptop, which is my normal drinky party activity. 🙂" "You're not invited anyway," she said.
In general I am not very fun to have at drinky parties. My own interests in life are mainly math, women, and making money. I'm actually only really interested in math, but in order to fit into society you are expected to have "normal" hobbies, so I picked the top normal thing that people do which I didn't mind doing, i.e. being sexual, and then I decided to be as straight vanilla as possible in practice in order to minimise complexity - though I would probably count as pan- or bi- in terms of what I can adapt to. As for making money, that is just a matter of buffering time so that I can do more math at some point (well that is the ongoing gamble, I suppose).
So when I get invited to local drinky parties, which is very rarely for good reason - I tend to just work on my laptop in a corner. Well nowadays I guess reading on my phone or tablet would make sense. Unless of course, I have specific information that I would like to obtain from the participants, in which case I work the room.
Another way I try to fit in is to host. That's how I ended up studying hospitality, which turned into several years of (ongoing) work. I like that role. It is the world's oldest profession.