There are places you go to be alone.  To get away from people.  Some folks go to the roof, some to the beach, others might just go for a run.  One of my places is my car when I drive to work.  Crank up the KMFDM and drive.  Me and Sascha singin' away.  (My wife really doesn't consider what they do singing but, hey...)
Then there are places you go where you aren't necessarily alone, but people should leave you alone. 
When I'm using the bathroom I really expect to be left alone.  It is a bit unnerving standing there with your yank while the guy using the next urinal decides he wants to be your best bud.
Dude! If I'm sitting on the toilet I really don't need someone in the next stall asking me how my weekend was.  I'm here to do my thing and get out.
I'm sure it's just me.  Chicks always travel as a gaggle to the bathroom.  (Something I've never understood and really don't feel the need to!)  I suppose I just don't feel the need to be making friends in the bathroom. 

There once was a movie whose tagline was, "There are some places in the universe you don't go alone." 
I believe there are.