As a DM I would probably assume the player was fucking with me (because that's the mood in my friend groups)
But my response would be something like 'fine, but realize not every adventure will be wheelchair accessible, you could hardly take a wheelchair into a goblin cave. The world is not naturally kind to disabled people and this world will not be adjusted for you character'
Yeah my scrawny ass flew up that thing then let go from to top to fall into the big fluffy mat