I think the sticker is funny, that being said...
1. Even if you never leave the car un-attended, which one day you just might have to, even if you are at a car show standing right next to the car there is no way for you to watch all sides all the time. Pretty easy for someone who you think is walking by and admiring it to have a key in their hand and give your paint job some new touches that you are not going to like to much.
2. If you're going to sport the sticker, at least get one that says "Ricers" and not imports. I wouldn't call most of the imports a P**** car, many of them are bad a**
3. Like the other guy said, I think it's hilarious that the sticker is next to a chrome transformer emblem adhered to the glass. That doesn't exactly scream bad a** American muscle. If I had a "import" Mercedes AMG, M5, Lexus Coupe, or the other countless imports that are awesome, and walked by and read your sticker and then seen the cheap looking transformers emblem, I would be thinking that you are the ricer type. After all, aren't they the ones who go to the corner auto store and stick chrome junk and stickers all over their cars. Maybe your a "Ricer" at heart.
That being said, I think your sticker is funny. Putting it on your car, probably a bonehead move that you will regret when a "import" decides to chuck their yoohoo at your car when driving by or key your car at a show. Which I'll bet 10 to 1 will happen, maybe not in the form of a yoohoo bottle, but someone is going to do something to that car who reads your sticker and does not like it, unfortunately that's how people are.
Seems like just asking for trouble, who knows though, maybe when trouble comes knocking your Camaro will transform into a crime fighting justice machine and take care of the issue at hand, my guess is that it will just sit there as someone is keying it though.
Enjoy the sticker!