Making fun of someone with a neurological disorder is pretty selfish and just wrong.
If you saw someone in a wheelchair would you point and laugh?
What about someone who was born blind or deaf... would you point and laugh at them and then tell other people to point and laugh too?
Sure the actual things he is saying in the video may seem funny to you, but laughing at this is the equivalent to laughing at a Vietnam veteran who lost his leg, try to hop one-legged down stairs.
Sure anyone else holding up one leg and being stupid by trying to hop down the stairs with one leg would be worth a laugh.
But not someone who doesn't have the choice to walk down normally.