Originally Posted by VCURamFan
Well the idea is that when someone is called a fag, the implication is that there's something wrong with them. That they are as abnormal for that action/belief/etc. as a "real" fag is for their actions/beliefs/etc. So to use fag as an insult implies that simply being that gay is, in and of itself, an abnormal state of affairs & deserves to be mocked/derided/etc.
And you must not offend regardless of how stupid otherwise. Hollywood's compliance with this borders on stupid. For example, I was watching an episode of Criminal Minds. Plot: Gay boy is raised by prison guard who tries to beat gayness out of said gay. Gay graduates, moves to Florida, and proceeds to seek out gay guys for a date and when they hit on him he murders them. Becomes gay serial killer. When the Criminal Mind team finds him they are in the classic stand off and one of the team starts telling him, "There is nothing wrong with you."
This dude is a serial killer! And you say there is nothing wrong with him.