it's clear what you're supposed to do in these situations. take out your phone and film it, but always leave out the beginning so that people can make you famous by causing an outrage based on part of the story without context. ideally some riots come out of it, but here he was Asian and I haven't heard of ALM yet.
I like how the vid says it's unclear what sparked it. you filmed it. you were there, and you don't know? then why are you filming it? you don't know what you're looking at. judging by the way the people look, the old guy seems to be nuts. but who knows, maybe the Asian said something earlier. maybe the old guy started it out of thin air. we'll never know. but we'll definitely judge without knowing, and that's always good because that's how all great things come to exist.