This happened to me but in the opposite context. I own a gen Sub and was at a party and someone noticed my watch. He asked me about it and out and out said it "kinda" looked like a fake. I calmly assured him that it was in fact as real as it gets and asked him..."...why do you own a fake Rolex to know the difference??".
He didn't say much after that. Later on in the evening as I was leaving the party I got in my car to leave and he was out by where the cars were parked. He saw me get into my car and I quickly remarked to him that "see ya' I'm getting into my "fake" Lotus now. LOL...his look was priceless.
Yes, at the time I owned a Lotus twin turbo. btw, for the record I own many reps and I love them.