I thought that parents in China are very strict about instilling "the right" chopstick habits.
Theoretically, the proper form has some practical advantage. Practically, the difference in utility is minuscule.
It was absolutely a Big Deal part of table manners when I was a kid, FWIW. SE Asia, southern China, late 70's. FWIW.
And, in the UK and China and elsewhere, some parents are, evidently, decidedly not.
But no one would be offended if you didn’t hold it the right way