Only people I know because I like knowing who’s left handed among my friends and family because it helps with things, seating areangements being one obvious example. Or so I don’t just hand them scissors they can’t use or something.
My wife and one of my kids is a lefty. I’ve kinda grown used to half looking out for it in others but only idly. It was fun watching each of the kids to see if any of them would be.
A friend of mine dropped an absolute bomb one day that I’ll never forget: “There’s only right handed and wrong handed”. Definitely more than 20 years ago now but I never forgot it because I laughed so hard.