The truth is not immutable. It seems that many people on this site would elevate empirical facts (what is) into normative rules (what ought to be). Clearly, if X is just the Way Things Are, then there's no use fighting it; a good rationalist learns to accept that X is true, and work with that knowledge instead of ignoring its reality. (X could be anything from atheism to "black people statistically commit more crimes" to "most men refuse to marry a woman who can't cook".)

But just because something is empirically true now doesn't mean it has to be true forever. This is especially the case with social norms. Feminists aren't trying to say "men really don't care about a woman's cooking skills, and fathers who tell their daughters this are wrong". They're not denying that the world is this way, they're just denying that it ought to be this way. And a reliable way to change social norms is to teach new social norms to the next generation!

Be aware that when you speak a truth such as "Men only marry women who can cook", you are not just acknowledging a fact but perpetuating it. You are not just an objective scientific observer of a fact, but a subjective participant in that fact.