this word WHY can be a very annoying word. sometimes when we say something to someone, we just need him/her to absorb it and accept it as it is. and answer the question immediately. unfortunately, people are born to be naturally curious. and a bit nosy of course.
when a boss asks his worker to do something, the word why? coming from his worker can be very unnecessarily irritating.
or when a mother asks a teacher how her son is doing, having the teacher asks why? to the mother makes it really awkward. an initially a sincere question could eventually be seen as a gesture for not trusting the teacher.
at times it is easier (and more convenient) to keep quiet and answer a question accordingly. stop saying why?? coz not everyone is against you or questioning your ability.