I'm curious where a Jaguar F-Type R fits into this squishy definition. Loud, fast, fairly rare, beautiful, but doesn't have the over-the-top looks that grab attention. It's more like a sculpture, instead of something looking like it just walked out of Gold's Gym.
Then there was the car I built, Midlana, 1700lbs and 530hp with the boost cranked up, and something of a black sheep at just about any venue. Didn't fit in at import car shows, British car shows, or American hot rod shows, and yet, it was faster than just about anything in attendance, they just didn't know it, so it got little attention.
When I'd come to a light, I'd sneak glances around to see if anyone noticed. Not because I crave attention, but as a character study in human nature. I was amazed by the number of people who didn't notice it. Lost in thought, checking their phones, talking to someone in their car, their world stopped at their windshield. Anyway, it wasn't an everyday car, being open top, no heat, no AC, no windows, no radio, no luxuries at all. While it had supercar performance, for me, it was a constant frustration driving it in traffic. The analogy I used was that it's like having spent a lot on a thoroughbred race horse, yet only being allowed to walk it.
Lastly, totally agree about how it depends - a lot - on where you live. In SoCal, 911s seem a dime a dozen, so frequent that they register about the same reaction as Tesla's. Even Maserati sedans are invisible. Only true and rare exotics really get the attention, and even then, people are so into their own worlds, it doesn't happen much at lights.