That survey result has very little to do with the assertion that there is such a social pressure. All it implies is that respondents think it would be nice if there were.
My point is that there might be unconscious biases at play in parents, no matter what they might respond to a survey. It's not feasible for parents to account for 100% of their behavior when it comes to something as unimportant as this. IMO, this is something that just can't be determined scientifically.
> Would any parent have thought that 50 years ago?
Yes, not only was parents doing that recognized as common-but-not-dominant thing 50 years ago (as a near-50 GenXer, I was aware of it existing and being perceived by adult society that way as a kid), it was even before that a popular media cliche leveraging a social trope that it was a real if eccentric recurring pattern (especially by fathers without sons toward girls) even earlier.