I’m unsure about this at the moment - and it really depends on the person / people I’m socialising with.
So, I have a boyfriend who I can spend endless hours with, without feeling exhausted. I think this is because he doesn’t have any emotional subtext or social expectations, so it’s really easy to just be me with him.
With others, it varies depending on the people and the level of ‘social skill’ required for them. So I’ll be much less comfortable at a professional networking event, since I have to come off as vaguely ‘normal’, than I will at a private event where there’s no external consequences for coming off a little ‘weird’. My method as a teen was to just say something bizarre at the beginning of the conversation. This set the ‘standard’ pretty low and from then on I’d do OK because I wasn’t really expected to interact ‘normally’.
Recently, though, I’ve realised I have some pretty serious sensory processing issues with sounds and physical touch. So a lot of my issues with socialising with large groups, even where I’m allowed to be ‘weird’ or I know the people well, is that this kind of activity usually comes with a lot of background noise - even if that’s other conversations, music, traffic noise or something else. Having to concentrate on being social at any level, and being exposed to cacophonous sound, will wipe me out for days.
This does explain why I’d spend so many days in bed following a lot of social interaction in a public place - and why spending time with my girlfriend at home was far less exhausting than spending time with her on our regular long walks around the city.
I’ve got some hefty noise cancelling tech now - I’ve got the nuheara IQBuds. They changed my life, really. I can now leave the house without collapsing from exhaustion when I come back. I can spend time with friends, in public, without major issues. Setting them to receive speech and lower the background noise really helps, though it’s not perfect and does leave me a little more tired than if I go out on my own. But that’s completely manageable, now. I’d recommend them for anyone who has these kinds of sensory processing issues - and for those who don’t get a whole lot of use out of standard noise-cancelling (which I can only use indoors).