This is a good point. As annoyed as the OP was with her editor making assumptions about women and treating them as a monolith, she does the same thing by assuming all women are the same. Why should we take her at her word that she is representative of her demographic? And isn’t the notion of her demographic treating them as a monolith?
Perhaps she’s representative of a certain kind of women in a certain age group, but perhaps the editor has access to market research showing demographic trends and what types of things have worked with certain demographics in the past.
Some women prefer traditionally feminine things and some don’t, and an endless mix in between. I took a girlfriend to the gun range for Valentine’s Day some years back and she loved it. Point being, no demographic is monolithic.