@sassbott my two pence.
I think the people he's referencing are actually society's standard for women. You see it in the thread mentioned above, particularly for women, do not mention it's hard or you may have regretted it otherwise your a "unwomen" less womenly somehow, the kind of judgement which is not given to men. Like the nurture instinct can only be given by the women. Ignoring the many other societies where men are the child rearers and the nurtures.
It's what our society has for generations drilled into people, girls get dolls and prams, boys get trucks.
For your partner to tackle this he has be aware of the inner bias that's driving that uncomfortable feeling and realistically be honest with you about if he can be comfortable being uncomfortable. Not going but I want you but kinda would prefer if you were x, subtly shaming you for not instantly conforming.
If it keeps coming up I suspect it's due to him really not being at peace with it. Some people think they have flex but truly don't have as much flex as they thought, will say they have flex but try to bring the horse around as it were.Neither you or your partner are wrong, but it is wrong to flex if your doing it "just because". You wouldn't know how much flex you had until your asked to do it.
The reason why "you knew what you were getting into" question is moot point for the same reason "would you be able to kill someone" is moot point. You may think you know how you would react, but mostly people act on their base nature which may not align with their perception of their nature in that moment. No one is mystic Meg, the self righteous will say well i know what the outcome would be, but truly are the most misguided of them all.
Unless anyone is mystic Meg and then of course please dm next week lottery numbers ! Thank you in advance.
Just my two pence and please don't read this as a judgement.