My old suitemate moved out, and a new girl that does not know the rules of a suite bathroom moved in. When I’m in the bathroom, she will knock on the door. First rule: door closed means someone is inside.

I will pleasantly say, “just a minute!”
And she will say back through the door, “can you hurry? I really need to use the bathroom.”

Yeah, girl. So do I. That is why I am in it.

Second rule: Doesn’t she know that she shouldn’t handle her needs by plainly communicating them, but by sitting in her room, saying nothing, slowly filling with hate directed towards the person using the bathroom when she needs it? That’s what I do, and it works fine.