This is definitely true - but some of these are fairly universal, or at least that is my understanding. I believe the 'no sticking chopsticks upright in rice' one is shared between Japan, Korea, China, etc. for example - it looks like funerary incense/joss sticks in all three due to the shared aspects of their cultures, for example.
I still don’t understand why making my own bowl of rice (being used/eaten by a very much alive person) look like a funeral bowl of rice is a weird or bad thing.
So much of this stuff just seems like a social license to shame people.
