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You have a very good answer.
If I am asked why, I usually explain why. People usually say "I don't need a reason" when they can't think of a reason that would be socially acceptable.
I say, "What are you, the _____ police?"
The blank of course being whatever it was I liked or disliked.
That will work.You forgot the "effing"
I disagree...It is truly none of their business and we don't need reasons why we like or dislike something.