For me to give someone a firm and enthusiastic yes or no is to presume the person I am saying yes or no to is my equal, or at least someone I feel equal to saying yes or no to, as though they are a partner, a friend, someone with whom I am on the same footing. It presumes I am in possession of some power in the situation. It presumes the other person sees me as an equal, or something like a peer, and is waiting to see if they are going to get a yes or no before proceeding with whatever they'd like to happen next. It presumes the other person can see me at all, or cares to; that they have respect for me as though we are both the same.