This assumption is not exactly unwarranted.
I don't know the difference between a $1200 scooter or a dui-scooter. However, the overall opinion is if you aren't in a traditional vehicle or a crazy cyclist, you're riding the vehicle you're riding because you are not legally allowed to drive.
Even if there is a grain of truth in some stereotypes, it is harmful.
For about the same money you'd spend on one of those scooters you can easily get a used motorcycle that will be far more comfortable and performant, it just requires a valid license.
I can't understand why petrol mopeds are still sold.
I'm just curious because often the smaller the engine, the noisier it is.
When I bought my house, I bought electric lawn tools as small engines are pretty terrible polluters. I read an article several years ago, by Car and Driver I think. They took a push mower, a Fiat 500 and F150 Raptor and hooked them up to some emissions testing equipment. 30 minutes of running the mower had higher emissions, other than CO2, then driving the Raptor 3000 miles.
And a 50cc Moped or Scooter has an insane MPG its why they are used for deliveries.