Not a pick at all ... more like a case of someone running back to their base, screaming for help, and getting summarily ignored.
On the other hand, why would you even give a crap what he thinks ? Not responding to him would probably have pissed him off even more. Responding sends a signal that his claim may have credence. If I ever respond to something like this, I simply send back ... LOL ... no one else knows what I am laughing at ... but he does and probably causes him to froth at the mouth.
This is a prime example of what I have said before ... "There is always a small microcosm of people who need to explain away their suckage."