As someone who worked in country radio for awhile, I do get defensive when someone unfairly attacks the format, the music, the listeners, etc. and it seems this article is such.
That said, there is a place for fair criticism. Country (the music, format, and even portions of the audience) are not immune from fair criticism. Such fair criticism is often merely pointing out that "country" (all encompassing) is very white, very male, and very conservative (socially, politically, etc) and that's valid. It is no secret - for example - that in the post 9/11 era the artists who were of a more liberal bent were given a stark lesson in why it's okay to wave the flag, but if you go against that and question authority you can expect to be told to "shut up and sing."
Are female artists under-represented in label output and radio playlists? Yes. Should there be a quota that says "thou shalt play a female artist every other record"? No. But country (music, format, audience) should not be immune to someone from "outside" saying "hey, is it weird that Jason Aldean gets massive radio and label support, while Jason Isbell has to get exposure by going on NPR?"