First off, the whole banning gay men from donating blood is so 1980's. We have excellent screening tests now for blood and I seriously doubt that simply banning gay men from donating blood makes the supply any safer. When drunks and homeless people regularly sell plasma for their survival, you have to question how that is safer.
Meanwhile, in Gary, Indiana a man was donating blood when he was informed he did not qualify because he "looked gay" and therefore was ineligible because homosexuals are not allowed to donate blood. The man, twenty-two-year-old Aaron Pace, is not gay. Go figure?