My personal feelings are, if it's a safety issue, then it's serious business.
If somebody does something that is safe, but just non-standard, then I have no problems with it.
....Unless the driver himself is unsafe, particularly annoying or inconsiderate of his neighbors or people on the road. I think in the case of the culture we are looking at in this thread, it's the way the drivers of some of these cars conduct themselves on the streets that helps create the stereotype. It's the personalities of some of the people we may have met, who may have some of these cars, that we dislike, and after you see a few of them, it's easy to generalize that everyone is like this. Sometimes it's a local thing, and sometimes it's everywhere.
For example, in my local car forum, some people like to make fun of Hondas, and the eBay headlights/taillights, and shiny chrome or painted wheels, or big hood scoops, or anything that is slightly more gauche than functional. I didn't grow up around this scene though, I had no problems with it, I had some friends who did little cosmetic things to their cars, for fun, and they were very nice people in general. I didn't understand where all intense dislike came from. Apparently all of the people they grew up with, who did the same thing, weren't people they got along with. Maybe they were jealous of the attention, maybe those people were the jerks in their town (in some other town maybe it wasn't the Honda drivers, maybe it was the Volvo drivers, or Ford, or Chevy, or Dodge, or Alfa, or Nissan, or Subaru).
So, I forgot what my point was (must be getting old).
But, I think it's important to think about why we dislike something, be open minded, be mature. We don't have to be interested in everything, but let's not allow that to cloud our judgement and develop into an irrational hatred.
"No thank you, it's not my particular area of interest. If you like it, that's okay. I'm more into trucks/muscle cars/British roadsters/custom hot rods/V8's/4-cylinders/FWD/RWD/AWD/Beamers...... It looks like you put a lot of time and effort into your car and your hobby. And I respect it. Nice meeting you and good luck." .... And then you go hang out with your own group peacefully, and everyone is happy.
It's good to respect people that are different. It doesn't mean you have to pretend to be interested in what they do. Just treat people like people.