Yes, it ruins the handling. Yes, there are a lot of idiots with terrible-looking cars and legions of me-too customizers.
But it's still a group of people who put love and pride into their cars. You may not think they look good. Many people don't.
But that's not a good reason to hate a group.
It reminds me of something I read on a Muscle Car forum in the midst of a "lol imports are teh gay" discussion; "You know, the hot rod guys look at us the same way we look at kids in civics. We're all car people, even if we don't understand each other all the time."
As to the "ruining good cars" argument, it's no more ruining a car than welding a cage for racing.