I have no motion sickness in cars or on small boats. I grew up reading in the backseat of a car - no problems. On a 30ft sailboat? No problem. But on a cruise ship, if there are rough seas, I do get a little nauseated. I take meclizine and carry on with my day -making it to dinners when crew are unable etc. So I count myself fortunate. One cruise, I did end up with some bruises as I was rolled out of bed.
But I never wish seasickness or sickness inducing weather on others....