According to Gallup, via Garance Franke-Ruta of The Atlantic, a substantial portion of the American people believe that some 25% percent of our population is gay. The real number is somewhere between 2-5%, depending on your source, which seems reasonable to me. We've become a nation of oppressed minorities competing for the nation's attention ("awareness", as it were) and the largest and/or most oppressed minority gets attention in this cacophony of awareness.
Making your minority seem larger, or more oppressed than rival minorities garners more attention and thus, more sympathy. Sorry, but this practice is not only wrong, it's a selfish distraction from issues that actually deserve attention.