he was just quoting an x post but you initiated an attack on him for no reasons. i could be wrong but i don't see he had ever irked you in any least way before then. on a public forum every one is entitled to expressing opinions. whether the opinions are correct or not is up to an individual's perception. if you like them, great; if not, you could rebut and/or move on. by no means you should attack another blatantly especially toward one's integrity.
Move on.