Interesting discussion. But yeah, he basically tried to criticize UPB with incredibly convoluted academics. I do think Stef could have answered the self-interest in a much easier way, though.
First of all, it isn't a specific enough action to evaluate. But even if we go with it, someone could say 'everyone should act in their own self interest', but will then change their mind as soon as someone else decides it is in their own best interest to murder the person that put forward the statement.
I also noticed that the sidebar was full of videos from this guy criticizing anarcho-capitalists and Stephan/Freedomain specifically. Seems like a bit of an obsession.
He dislikes stefan for making his philosophy all of philosophy. Hes a pretty devoted student of philosophy