In my opinion, you've missed the point. By the time you get around to refuting him with facts, he's already been allowed to post potentially harmful disinformation, which is the goal. He's being given a platform to do so, here.
Of all the many times you've corrected him with facts, has he ever written back and stated something like, "my bad, I misinterpreted that, I didn't read that correctly, I didn't know that, thanks'? Or, does he just ignore your comments and keep posting lies?
Who could possible take a 26 year old idiot like Fuentes seriously? Yet, by him having various platforms for his hate messaging, it's found ears and followers.