A Hindu pm had the habit of sitting next to developers while they worked, sometimes putting a hand on their knee
Eh... That doesn't sound like just an Indian being Indian.
a Japanese guy came to the hr person complaining the original lady from us had hugged them. Again, it was explained that this is just what Americans do
Nope... We don't hug people who don't want to be hugged. The Japanese guy was right to complain, and the American woman should've been asked to be more careful.
Expecting everyone to just accept anything because "that's what they do where they're from" is setting things up for people to be actually victimized and to feel like your company is fine with it.