Yon has written some truly great stuff. I would not classify him necessarily as a great reporter, but definitely a determined one. That said this is not the first time he has failed to make complete sense of his own thoughts. He is definitely eccentric. I have a hard time actively disliking him because of this.
I've read Yon quite often, even buying one of his books. I would go so far to say I have always noticed not just eccentric, but ego-centric attitude in his writing. If he gets it in his head that he is slighted, then Yon will disparage the other and never lets a grudge go.
My suspicion is that there is a backstory to this turn of commentary. There was a fellow a while back that Yon hated from Afghan, some kind of bad blood, I don't recall the details. That same guy gets arrested in Texas for open carrying a rifle. Yon warned the gun community to not aid this guys' efforts, cause he's a nut that probably instigated a confrontation. My guess is that these comments all link back to that story.