I agree that women in the US generally seem to talk more about bad experiences they have in tech than women in Europe. But there are several possible explanations for this observation, and you've picked the laziest one.
For example, consider the possibility that people become more willing to report bad experiences if the people they tell will be willing to acknowledge that the problem is not uncommon, and unlikely to react with disbelief.
That would explain our observation without suggesting that Europe has fewer incidents; in fact it would suggest that it has more, but doesn't have a culture of admitting and dealing with them.
For example, consider the possibility that people become more willing to report bad experiences if the people they tell will be willing to acknowledge that the problem is not uncommon, and unlikely to react with disbelief.
That would explain our observation without suggesting that Europe has fewer incidents; in fact it would suggest that it has more, but doesn't have a culture of admitting and dealing with them.