I'm gonna go with civic owners, they are arrogant, ignorant and usually try to start crap with everyone they see. Lets face it a civic is rarely capable of much more than a 13 sec pass, and thats with a swap to an integra engine or buyng a turbo or supercharger kit. The fast civics that do exist are far from street legal, they are stripped down, no emissions, slicks, and so modded that the driveability is gone.
Say what you will about mustangs, as domestics go I prefer TA's, and camaros but the mustang is a potent pack if tuned right and a lot of thier owners are just into them llike we are into supra's they may diss on imports or supras but most of them know enough to respect cars that are fast. They also can run 10 sec times and still be daily driveable unlike the small winky syndrome civic owners who have to make up for a POS 1.6 or 1.8 liter crap NA motor with a big mouth.