>Imagine that you just heard a mom tell her kid, 'Don't be so bossy!' What gender is the child that she is addressing?

Imagine if you heard a parent tell their child "don't be an asshole". What gender is the child? I think it's true that women are held to a different standard when it comes to assertiveness, but the existence of a female-specific insult is not evidence of that. There are plenty of male-specific insults of the same nature. Asshole, dick, douche, prick, bastard, etcetera