Don’t Take That Tone With Her
When I was fourteen, I in no way dressed feminine; I wore baggy 2000s sports clothes (always black if possible) and a crappy cap. Yeah, I was very cool.
I had been to the toilet in the mall and was whistling a tune to myself while washing my hands. An older cleaning lady in the room turned toward me with a scowl and said, in the nastiest tone only grumpy old ladies can produce:
Old Lady: “Girls don’t whistle!”
And then, she left with her cleaning trolley, while I just stood there looking dumbfounded at the encounter. It still baffles me to this day how much low whistling apparently could offend someone… and that whistling is gendered.