Which stall do you take? Do you have a preference?

I’m writing from work because I thought of a question and had a minute, so….
When using a public estroom, I always take an end stall. I don’t care which, but I don’t want people sitting on either side of me if I can help it. I also try not to sit right next to someone if I can avoid it. I’ll wait.
I don’t understand why someone would choose a stall right next to someone if there are open stalls further down. It really bothers me to have someone plop themselves down right smack next to me if they don’t have to,
I understand that there is the barrier of a wall there, but it’s mostly psychological. Geographically speaking, that places you within two feet of me and I really, really would rather that you sat a bit firther down.
I won’t get into the cleanliness thing right now, I’m more concerned with people being inside of what I consider to be my bubble. What do you do when you are in a public restroom? Do you care? Do you even notice?