Depends on where you are when you meet these people too. For example #9, I work in an office of H1Bs from India, there are no hangups about left hand use, but we have modern bathrooms with modern supplies too, being smack dab in the middle of the continental USA.
If in contradistinction it was in the middle of Calcutta, some squeamishness might be understood.
Maybe.
I guess if we were trapped in the middle of a desert for a while, we might adopt a similar custom eventually too.
lol