I hope it doesnt take until 2050 to see some kind of international socialist movement. I think we need to prepare for revolutionary action within our own countries and the best we can hope from China is they would support it if we were to succeed. And as other people said getting organized is key to that -- there are many spontaneous events that help radicalize people but its about seizing those opportunities to create a lasting movement.
China's non-interventionism is both a blessing and a curse.
You are not going to change his mind with one conversation. At best you can plant seeds and teach him something new or correct some misunderstanding he has of marxism (which sounds like he has alot of)