I guess people haven't fully realized that we're truly living in the 21st century, I think preconceived ideas are still ingrained in most people and that's what they default on whenever they see something different. Nowadays, the line between gender roles has become blurry and the stereotypic mindset should be outgrown because it no longer holds much relevance.
Yes, some are yet to break free from such a mindset. Hopefully, they will wake up sooner so they won't influence the younger generation :)