If you want to fight for the inclusion of disabled people in society there are better ways to spend your effort than trying to police the use of the word dumb.

Nope, against.

I don’t see why this rethoric would need any special rules versus any other arguments that may be made in bad faith. Trolling in general should be moderated, but the rules shouldn’t differ from topic to topic. If a discussion is good it is good, if it is bad it is bad. The topic and the view points are irrelevant to that.