In an article about the growing tensions between people with kids and people who choose not to have kids author Ellen Walker brings up the fact that the conflicts between parents and child-free adults exist more between women than between men:
The tension between parents and childfree women has extended to the media. English journalist Polly Vernon received hate mail when she wrote, "I don't want children." Keep in mind that she never said, "I don't like children," so it's not clear why anyone felt threatened by her remark. My guess is that when a woman says that she does not want to have children, this causes all women to question themselves. Many are probably saying to themselves, "You mean, I had a choice? I thought I had to become a mom." Others simply feel criticized, as if their role as a mother, said to be the most important and most fulfilling thing a woman does in her life is perhaps not so.
What About Friction Between Childfree Men and Fathers?
The friction that exists between moms and childfree women does not exist on the same level between childfree men and fathers. Men in our society have much more broadly defined life roles, and being a dad is just one of these. They're much more focused on their careers and even their hobbies than mothers tend to be, and so they have more in common with men who don't have children than mothers do with childfree women. Some mothers may feel threatened by their husband's childfree friends, because of the freedom they have in their schedules, the extra financial resources. They may worry that their husbands will yearn for this less demanding lifestyle.