Here in the UK we set the table to use forks in our left hand - knives in the right. Some people, both right and left handed in writing, change the hands used. One of my offspring does this. These days it would not usually be remarked upon.
For some deserts a spoon and a fork are used, and the fork would be used in the left hand, spoon in the right, but I reverse this. I use a soup spoon lefthanded too.
Being used to feeding myself left handed I use chopsticks in that hand. although I can manage right handed I am not as deft with that hand. This is quite shocking to those who traditionally use chopsticks and so I do not ask for chopsticks when eating in their restauraunts.
Handedness is not a set thing - for instance my sister writes with her left hand but uses scissors in her right, I use the left and have left handed scissors.
I am 60 years old now, but still remember the dissapproval of my father and his father when I picked up a pencil or crayon. I would have been only 4 or 5 years old. My mother was rather sharp with them and they stopped commenting.
I think it wise to work with both hands as much as possible - accident or illness could easily incapacitate a hand, leading to temporary or even permanent disability. It might make the difference between a good life and a miserable one to have some degree of ambidextrous ability.