Let's Talk About Bathrooms

I'm not talking about kids using the bathroom, I'm talking about them bothering you when you are! Maybe they are trained from when they are toddlers and you force them in a stall with you are in public places. L would try and escape the stall as soon as you were not watching her like a hawk. Now though at home there is almost ZERO alone time. It drives me nuts! I don't want or need an audience. I don't even like the dog greeting me when I am half awake in the morning! Mind you my house has 3 1/2 baths for two of us. For some reason the easiest accessible/best working bath L has decided is hers and freaks out if I ask her to leave while I am in there. Sometimes things go down hill and it turns into to an angry, screaming argument. I don't know what to do, but sneak in there when her attention is diverted. This does not give me hope for the future.