Could you go into detail what you mean with the last sentence? Example: Should I assume someone else can not walk somewhere when they ask me for directions after walking to me? Surely that is not what you mean, but all the examples I can come up with in this moment are about as absurd as that. I can not see how always assuming others might have some (relevant to the situation) disability would help me interact with them instead of doing the exact opposite.
Ooooooh now I get what you mean!