I doubt that the OP was even thinking of Newt or Santorum being in drag. The intent seems to be to compare Newt to a woman who is considered to be a little odd and unattractive. What does Susan Boyles have to do with the U.S. Republican primaries? Nothing whatsoever. Comparing Newt to Susan Boyles is just a cheap shot at a woman who doesn't conform to popular ideas of beauty and behavior for women. The OP was petty and nasty, but not because of anything to do with transgender people.
It really makes me mad, because what harm has Susan Boyles one anyone? She's just trying to make a living like an other decent person. New Gingrich is scum. He is fortunate to be compared to Susan Boyles. She has a million times more talent and personality then he'll ever dream of. Whiny, weasely little failure of a man - how dare some DUer come along and drag Susan Boyles into this? (I'm not even a fan. It just makes me mad to see a woman picked on like this. Reminds me of junior high where the "odd" people got bullied.)
Maybe if the alerter had pointed out the sexism inherent in the OP the jury would have decided differently, but I doubt it. Much of DU is similarly clueless when it comes to sexist language.