Milhouse, Rav Moshe says hat any posek can disagree with the Arizal.
Gavriel, “whistling to yourself”? Do you mean like a dog whistle? BTW, according to the Independent “In a survey by YouGov, the proportion people finding the pastime annoying has increased with 47 per cent of people polled saying they found it irritating.
That figure rose to 53 per cent among 18-24 year olds suggesting fondness for whistling may slowly die out as the years pass.” So either SPD is becoming common or that is just one reason. People are becoming more refined and whistling is a sign of lack of refinement.