I've poked fun at the concept of homophobia before. I'm pretty sure it is a made up illness for the most part.
Except for one extremely deadly variety: Homophobic Panic. That's when due to obsessing over homosexuals, a young man, already full of testosterone and as another blogger recently put it, that devil on the shoulder whispering that violence is the solution to what to have for lunch, gets paranoid about somebody who isn't even likely gay, being a gay rapist.
This of course leads to a gay bashing incident- and if the "gay" being bashed is armed like George Zimmerman was, it can be a deadly, deadly error.