Are your friends all diagnosed, or have they just decided they're 'on the Spectrum' because they're 'different'?
I think I've probably met a few undiagnosed Aspies in my life, but no more than a handful. I've never heard of formally diagnosed anti-social (or non-social) Aspergians running around in packs, in public places no less. For me, that would require a lot of heavy drinking (and since I don't do public restrooms, there's a bit of Catch-22). Actually, it would seem more Aspertypical to me for the group to prefer gathering in someone's home, where the noise level and unexpected stimuli could be contained to some extent.
Just wondering if your friends don't have the same reactions as you because they don't actually have the same handicap you have. Your reactions sound perfectly typical for someone with AS. I can't imagine why they wouldn't be experiencing pretty much the same thing. If they don't, something's not quite right - er - wrong.

And I can't speak for the world BTW, but I for one do not find social interaction of any kind (except sex - is that social?) to be invigorating. It wears me to a frazzle in no time at all, even with people I know and like.
They have diagnoses, for sure. It's at an autism centre I met them. So they're genuinely on the spectrum. I'd have to assume much more mildly so, compared to me.