There's also the fact that there was a concerted effort to beat left-handedness out of people for a very very long time.

https://en.m.wikipedia.org/wiki/Bias_against_left-handed_people

If you go down to Unfavourable Perceptions, there's a load of info on this. Efforts in North America to switch everyone to right-handedness ended around ghe 60s and lefties were more socially accepted by the late 70s. That said there's still a lot of places in Asia that attempt to force lefties to be righties.

My mum is a leftie and in school was beaten for writing with her left hand.