One particularly green kid, just out of high school, is having some workplace issues and he wants your help. Yes, your help. Because you've got a great record with this stuff and you always give great advice. He posted his question to Reddit, so hopefully his boss will see it and change his behavior. If not, it's all up to you.
The comments are pretty much split—some think it's perfectly normal since the bathroom doesn't have a lock, while others say it's overstepping to barge into the poop room to ask a mundane work question.
What you really have to consider, though, is all the boss's other behavior. Is he normally a nice guy? Doesn't seem like it. It seems like the only thing standing between this kid making a decent wage as a 3D printing-specialist and him quitting in a fit of rage is his ten minute daily poop.
Who's the boss to get in the way of that? Let the kid poop. Let him go in there and play Angry Birds while he's letting out an angry turd. Give him a work-free poop break and you'll have a much happier, much lighter staff. And while you're revising bathroom policy, 3D print a few more stalls. Only one stall? That's so shitty.