That's the "all lives matter" argument. The problem with it is that rights are not distributed equally, they are biased towards the privileged. Making special accommodation for someone with a disability isn't giving them special rights, it's leveling the playing field that is tilted against them.

Reasonable in this case means providing a way for them allowing them to do their job in spite of their limitations. The "privilege" they are being granted is being able to work at all, which is a privilege most people have naturally and take for granted.