Of course as a scooter rider you say its a motorcycle. That wiki entry was probably written by a scooter rider also. ;-)

I actually feel a fellowship with all two-wheel riders but don't let any other bikers know or I'll be shunned.

They're not really considered as such by motorcycle people, for decent reasons too. Scooters generally have rather different ergonomics and controls, notably CVTs rather than manual transmissions for "proper" motorcycles. Overall a pretty different experience to ride. There's not really a good umbrella term, either, though.

I live in Vietnam where the entire population drives small motorbikes or scooters. There's no defining feature except for having a cutaway to place your feet in a scooter. Even the engine placement is less of a clear thing now that many of them are electric.

There's motorbikes with scooter like controls, there's scooters with motorbike like controls. Many small automatic motorbikes feel basically identical to driving a scooter except that your sitting position is very slightly different.

Presumably an American motorcycle purist's brain would simply explode in such an environment. :)

The "decent reasons" just sounds like snobbery or a reason to feel superior. Cars are cars, whether manual, automatic, CVT, whatever. Why should bikes be any different?

I'm a big fan of two-wheeled transport in all its forms, but wow is there a prevailing toxic attitude among a large group of "true motorcycle" riders. Instead of welcoming people into the fold, it's just tribalism -- you drive a scooter, you're not a true biker; you ride a cruiser, true bikers only drive super sports; you drive an e-bike, but only loud pipes make a true rider!

Agree about the snobbery, but there is a real difference in kind between them that would be nice to have a good name for. Even if, as the other reply pointed out, they exist on a spectrum, the endpoints are pretty distinct.