My trip to CVS

I don't mean to sound sexist.  Really, I don't.  But I expect the male of our species to have at least a little bit of automotive sense.  Cars are part of their genetic make up, aren't they?  Last night, I was standing in line at CVS behind what has to be the dumbest MAN on the planet.  He was trying to return a can of "Fix-a-flat" because it was defective.  He explained to the teenager behind the counter that he had sprayed it ON his tire and it didn't work.  Even the girl behind the counter had a hard time not laughing while she tried to explain that the fix-a-flat goes IN the tire...not on it. WTH? Someone really needs to revoke his man card!