That does not sound like a reasonable response. See chava for example of what happens when you make whats mutar assur.
There is a distinction between making what’s mutar assur, and building a “fence”.
In this case, privately owned publications have a right to set guidelines as they see fit. They can deny an advertisement if they don’t like the way your nose looks.
Society is being very smug and disingenuous about the way women are being projected. They are hypersexualizing women day in and day out and telling you that if you don’t like it then you are just plain sexist, because you are trying to “suppress” women’s bodies.
It’s NOT normal for a man to immediately have non-tznius thoughts when looking at a woman’s face. However, when women are portrayed to men from a very young age as objects, this is where their mind will race to. Fight me all you want on this, but you KNOW it’s true.
Personally, I think that they SHOULD publish women in their publications in SPITE of society’s downfall. But I don’t blame them for taking a stance.