Women always had tendencies to be shallow, they just were taught from a young age not to be 70-100 years ago, so by adulthood, being more gentle and thoughtful became more natural. In the past 30 years, those strict teachings disappeared so there is no longer any reason for women now to naturally feel the need to act the way they once did and they therefore obviously now don't. Now, their natural tendencies which they were once taught to squash have now flourished to new levels.