Unless you have a specific example, merely omitting mention of both genders hardly qualifies as "sexism" to me? There are plenty of gender-specific magazines for females that do the same thing all the time. I don't see why everyone must now pepper their prose with "he or she" and use an exact 50/50 proportion of examples using both male and female names (actually, you wouldn't need an equal proportion, as it seems that sexism only applies to men) lest they be labeled sexist?

Secondly, just because it's popular today to think of men differently than the "old-fashioned way" doesn't mean that modern thought is "more correct" as to what defines a man, nor does it mean that people who disagree with the modern idea are "wrong" (I'm not suggesting that the "old-fashioned way" is in anyway correct either, but still people have different opinions - and the popular modern idea is just one more).

But I digress, the blog is quite self-aware and I've always read it with a sort of tongue-in-cheek sense of humor; the "gratuitously" throwing in of "man" and "manliness" is part of the writing style.