Comparing our culture to others, women in the U.S. are raised to do much the same. Ask anyone woman constantly misgendered for not having a high-pitched woman’s speaking tone (e.g. pacific islanders) and they’ll confirm. Best not throw stones from glass houses.
Sure, I've been here for almost 20 years. It doesn't change a fact it sounds stupid. I asked two colleagues from Japan and they both agreed this probably wasn't done by a japanese person.