Sounds pretty messed, but honestly I don't know if killing gay people counts as genocide... not that I'm supporting it or anything, just a matter of terms. though this does deal with the issue of "are you born gay." If you are born with your sexual orientation then the UN should stop any sort of government led random killing. If you're not born with your sexual orientation, then technically I guess it's up to each individual country to decide their policies on such matters.
Personally, i think you are born with it, but then what do I know?