You just opened up his Pandora's box of consciousness. He was trying to trick himself into thinking he's not riding someone else's bike, and you correctly informed him he probably was, so he felt inferior, threatened and embarassed. Same thing happens when your wife tries to return a louis vuitton purse to the store only to find out its actually a knockoff you bought at Times Square. Sometimes deals are so good you are willing to ignore the reason they are so. I'd never buy anything from Igor because you can't tell what he's rubbed his d*ck and a*s on.