Does that example really require masking? Absolute not. You don't have to lie when you provide a neutral response. Examples: "Busy day", "Just feeling tired", "Many things to get done.". Those are not necessarily good or bad and suggest you aren't making small talk.
Or, if you provide a never ending story they will see your disability for what it is and they won't ask you a second time.
Or, if you provide a never ending story they will see your disability for what it is and they won't ask you a second time.