I have to admit that I find this vaguely distasteful. She's always struck me as kind of a simpleton, and the lyrics seem to bear this out: it's whiny, self-indulgent trash. Basically, she seems to be saying that because Mark (a) is a hero, and (b) is gay, everyone should just automatically KNOW that it's wrong to hate gay people, and that they CANNOT behave otherwise after they understand this fact.
You know, it's just not that simple.
Still, it's cool to join the club of people that have a song written about them, á la Michel Gondry.