What is most interesting is the presence of Vance and that he started the argument. Yesterday he was with Trump and the British PM and accused the UK of being against free speech. I don’t recall VPs being active in such meetings before now. It says a lot that Vance is taking such a prominent role in areas that VPs traditionally do not publicly venture in.
He needs to establish himself as a leader (this behavior doesn't help beyond maybe their base) if he wants to be president after Trump. It's also ingratiating behavior towards Trump which will help ensure he remains on his good side and part of the in-crowd.