Well, Guest, you are probably a free citizen of the free world. If you enjoy whistling, do it.

A friend once heard me whistling a little and said, "A whistling girl and a crowing hen; both will come to no good end." I looked at her and said, "Does it bother you that I'm happy?" That was the last time I heard that jaded, hick wisecrack.
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Once I was watching at a dance session in a home. They announced that they were going to do a number that had lyrics and a descant, so I felt free to whistle along in harmony. There was a parakeet (budgie) there, and the parakeet heard the whistling and broke into joyous tweeting.

At the end of the song, somebody exclaimed, "That bird! That bird is incredible!" I decided to keep silent about my part in the duet. Why burst somebody's bubble?