All of the incidents of claimed harassment in tech that have resulted in enough noise that I have noticed them (5, if I am remembering correctly) have involved North American women. I think they were all in the United States, in fact.

There could be some bias because I'm in the United States, and most of the tech news and tech discussion sites I read are in the US, so I'm probably more likely to learn of things happening in the US than in the rest of the world. Still, given that every example I can think of is North American, I cannot criticize his observation.