This may come as a surprise to most of you but I actually support graffiti, especially the kind seen in bathroom stalls. Those ones in particular give me something entertaining to read while horrible things exude from my rectum and anything that can entertain me while that happens is okay by me.
Now I know what you're saying. You're saying, "But Jason, people write horribly racist things in those stalls?", and you're right, they do. But in response to that, I just take that shit with a grain of salt because it's dumb. The good stuff is the vindictive things guys write about ex-girlfriends and the nuggets of personal philosophy.
So in closing, write on bathroom stalls but if you get caught, tell them Lyndon LaRouche sent you.