I agree, it's more of just good ol' ribbing than anything else.
I have owned a mustang cobra, which was an insanely fast car, and a helluva lot of fun to drive. I've also had 3 Trans Ams and a Camaro and they were hella fun to drive too.
Personally, I don't have anything against Ford owners, or mustang owners in general. In fact, the guys who I had tune my last truck were mustang guys and they were the most precise, good-natured and knowledgeable people. I have never seen a tuner who took as much time as needed to get the air:fuel ratio PERFECT like they did. Most people are like "eh, that's pretty close, you're good to go".
As far as the new Mustangs go, I really like the styling. I actually drove one and was mighty close to buying one before I bought the goat. The one I was looking at was black/red, just like yours. I think Ford did a great job of melding the new and the old. For me, it all came down to price though. The Ford dealer didn't really seem like they wanted to work with me, the Pontiac dealer did. I'm very happy with my choice. I guess my only real problem with the new mustang is that you can't turn around without seeing one. They're EVERYWHERE! I drove 3000 miles two weeks ago and didn't see a single other GTO. We're part of a rather exclusive club, that's just not something you can be a part of with the Mustang. Maybe that's not a bad thing, I mean you guys have a whole plethora of performance parts to choose from. It seems like the aftermarket is just now getting their 05 GTO parts out.
I rev my engine when I meet a Mustang at a stoplight, it's all in good fun though. One of these days I'll probably run into a highly modified Mustang that will hand my arse to me. I'd congratulate that driver just as I would another GTO driver.
I guess when it comes to perception, the Mustang is more of the boy-racer car, while the GTO is a bit more refined.
I don't have anything against ya though, even if you DO drive an inferior car!! (haha, just kiddin')