> Why did you assume that "mom" is the dominant descriptor in the term "mommy blogger" rather than "blogger" or the whole term?

If he'd meant "blogger" generically he could simply have used the word unmodified. Instead, he specialized it by using a gendered term to repeat a common stereotype about a broad class of people. Have you ever heard anyone use a neutral or male identified term in a context like this? Would the point have any way been worse as “No sports-blogger“ or “No photo-blogger”?

As for your attempt to claim that this is somehow due to my not knowing the definition of the term, I would note that your choice to resort to personal attacks rather comically undercuts your proclaimed desire for “rational discourse”.