Quote from redlinks
You mean to tell us that you've never been annoyed by someone who always asks why all the time?
Only if they are just mindlessly doing it to troll. Meaning that they question has no purpose, substance, or meaning, and isn't a genuine/honest question.
In other words:
It's not about the word "why" (or any other of the options), but the substance of the question, that determines if it is annoying. Just as I said in my initial post.