That's the outward appearance.<quoted text>
So a reply of, "I don't know... I might agree or disagree with that stance, maybe. <shrug>." indicates a non-negative response to a tiresome person.
But it is hostility, you are not wasting a second more then is needed to disentangle yourselve from the situation without open agression. If someone might angle on you could snap or being tired yourselve throw out an iritatd:'well allright then!" and regretting that later.
But it is about body language.
Just reading or hearing a person of miles away can end up quite costly. You miss the bodylanguage for the proper interpretation.
If someone looked really tired and then said : maybe.
I would not take it that hard. And there is a good chance the person will ask you when being less tired.
But i'll bet most people are aware that maybe is the least you can get away with...and that you probably have to make up for it in some way.
Just observe it happening. Quite curious what your findings will be after a week or so.