It has always pissed me off the way "motorcycles" are seen different from scooters. Technically and legally, they are all motorcycles. That's like saying a cruiser is not a motorcycle. Or a enduro is not one.
I'd say almost anywhere in the world, you use the same license to ride either. Riding a scooter puts you in the same risks as other bikes.
But still, many see scooters are not-motorcycles and beneath them.
Pity
Actually it depends on the scooter and where you live.
Here, Technically and legally, most scooters are NOT motorcycles. They fall under mopeds, require no license or insurance. They're known as DUI rides because they're your only choice once you lose your license.
They are all under 50cc, no gears, 4hp or so.. and looked down upon.
On the otherhand, elsewhere in the world you have silverwings and other mega-scooters more common... they're comfortable motorcycles that you happen to step though. The step through part defines them as a scooter, but legally and objectively they are motorcycles.
I have no problem with mopeds or scooters.. I just draw the distinction at being step through or not... and I kind of ignore the low power ones as they are very limited as transportation when your country is connected via interstate travel. US highways have a horsepower minimum.