So I take it you're opposed to the ADA in general?
I don't understand why you're making a legal argument now when the root of your opinion is a moral one ("Being forced to work at gunpoint is known as slavery"). It sounds like the states' rights argument is just a convenient legal pretext for what you really want, which is the freedom to discriminate against disabled people.
Do you know anyone close to you that you can comfortably ask what limits and bumps there are out there for them to be able to comfortably use the internet?