It’s certainly not dumb, it’s actually a pretty good question!
In some occasions, yes. I know that even just being around children can sometimes trigger one of my littles to come out. And sometimes being around anything that’s similar to my alters can trigger them out. A good example of this is when I worked as an actor in a haunted house- My alter Quinn, who claims to actually be a ghost, would come out a lot while I was there, although I didn’t know it at the time. And sometimes talking to other people with DID can trigger one of my alters to come out to talk too.
But this all depends on the person and situation. There are plenty of times when people with DID can talk, hang out, etc, and not switch. I think you should ask twozland what their take on this is, being that (from what I understand) they’re two DID systems that live together :) They may be able to give more insight on this than I can, having never physically met another person with DID (that I know of, anyway!).