It seems like a very practical "solution" to me. The idea is to facilitate folks having their own space where they can "feel" comfortable without making others feel the opposite. What is wrong with that? It tends to mitigate a certain negative economic externality here does it not?
Because it's a freaking park? If you want to designate a space for dudes to get together for anonymous sex, fine, my beef is that it's in a freaking park. Don't they have gay clubs there? Designate gay clubs as the place for anonymous gay sex.