Earlier quoted context omitted.
I think if you were to do an Osaka version of this, the list would be limited to maybe 4 of these (licking, chopsticks upright in rice, passing between chopsticks, and pointing esp. toward a senior would be taboo). Whereas when I had a date with a girl from Kyoto, one of the first things that happened when we went to eat was she had to stop me from picking up my chopsticks impolitely and show me the proper way of doi…
Do you know how serious "chopsticks upright in rice" is? I had a Chinese teacher who mentioned the taboo (with regard to China, not Japan), but she also said that while people recognize that it's something you're not supposed to do, it's not taken seriously either.
I did not make that mistake ever again.
For context - it's a way of saying "death to your family" or something akin to that.