Show them the window sticker. 80% German parts content, built in Germany, on the exact same assembly line as many other Mercedes vehicles. Same control arms as an SL model, the same 3.2L enging used in MANY Mercedes vehicles, Slaptick Auto that is far superior to "Chrysler's" version. In fact, the auto used in the SRT-6 is extremely similar to the one used in the SLR Mclaren. The list goes on.

If you want to **** them off, tell them their Jaguar is 50% Ford. The Saab is a re-badged Saturn/Opel, effectively. 2006-2007 Lamborghini Murcielago used the same HVAC controls of a VW GTI, thanks to the VAG merge a few years back. The Infiniti FX-45 uses 80% parts content from a "lowly" 350Z. No matter WHAT pedigree these people are driving, chances are the "unseen parts" are sourced from MUCH cheaper autos. Ask me how I know.

Regardlless of the badge, I would dare say the quality of this car far surpasses anything that the antagonists are driving. Smile, accept their disdain, and have peace knowing that your car will turn more heads than theirs.