You can chuckle, call bullsh** as much as you want, both of you.
Also you can mention Third World Bajajs, hybrid scoot-motorcycle models or compare scooters with ABS versus motorcycles without ABS. (there are motorcycles with ABS too, you know), also as much as you want.
Unlike most people here who can barely keep their scooter upright, I have been driving daily through rain, snow and wind all my scooters and motorcycles, and scooters and motorcycles of my friends, so I guess I have a say here.
While you are there, study a bit angles of the steering and front wheel of an average naked or sports tourer and weight distribution in comparison to any scooter, wheelbase, tire quality, tire profile. While you are there, take a look at usual three way adjustable front and rear suspension of average sports or naked tourer and compare it to average scooter's "it is good that there is ANY suspension at all" suspension, brakes and tires. Take a look at material used for brake discs, heat dissipation pattern, brake pads and number of pistons.
Maybe, JUST MAYBE, you will understand why with sports bike or naked tourer you will be able to stop or swerve and with scooter you will end up with parts down the road, as one member just said.
Also, account for the fact that 250 cc scoot weighs as much as 600 cc sports bike while all 500 cc scoots exceed the weight of all big bore 1300 cc naked tourers!
Mega scoots 700+ cc are usualy 60+ kg heavier than the heaviest big borers, further diminishing their performance in curves and braking distances.
Now I am expecting manic searching for scooter that has 2-way adjustable rear suspension or something like that, to prove that I am wrong. Or comparing 50 cc Chinese motorcycle with 800 cc top end scooter. Go ahead.