Not at my company. We’re more like a family than a traditional startup.
Run.
I would even openly admit that I voted your comment up to mitigate the punishment for your mistake, but then they would vote me down. So, I don't. Just so as not to be misunderstood.
Normal work schedule with grunt employees doing not mandated stuff together once in a while after work? Okay, that's nice, but you should still have a social group that's not (only) coworkers.
Huge difference.