Just a few quotes from /r/Parenting:
"BUT his dad had a conniption when he found out that I bought him a baby doll and he thinks that he should not play with “girl” toys." https://www.reddit.com/r/Parenting/comments/b403o6/how_do_yo...
"A lot of adults (men, women, young, old) make snarky comments in my son's presence about his toy selections (doll houses, play kitchen sets)." https://www.reddit.com/r/Parenting/comments/b403o6/how_do_yo...
"Now, my husband generally doesn't mind that my step-son plays Barbies or dollies with his sister. However, he draws the line at actually buying "girl" toys for him." https://www.reddit.com/r/Parenting/comments/53p1ut/boys_and_...
"I'm constantly reminded my girl isn't very "girly". At times I'm even asked whatever I'm concerned about her enjoy so many "boy's things"" https://www.reddit.com/r/Parenting/comments/2ke89r/parents_w...
[edit] what I mean is simply that those kinds of sentiments might be a reaction to perceived bias in culture, expressed as bias but not driven by same, if that makes sense. A kind of re-enforcing meta-bias. Again, doesn't make the effect any better.