I'm not going to argue about pg's pretentiousness or lack of, but I will suggest that trying to change someone's mind by presenting them with rational arguments

I'm not going to argue about pg's pretentiousness or lack of, but I will suggest that trying to change someone's mind by presenting them with rational arguments is never going to work to persuade them they're wrong. What someone posts on social media is a reflection of their identity; it's literally who they present themselves as to the world. A well-formed argument will be rationalized away whether it's right or wrong. The way to persuade someone to change their mind is to nudge them to think about what they're posting so they persuade themselves they're wrong. Target their beliefs, not their knowledge. If pg is wrong about something it isn't because he isn't informed about what's right. It's because he's chosen to frame something in a way that aligns to what he believes. (Hint: Everyone does this.)