You can only teach the teachable. If the person is dead on unteachable, regardless of your credentials, background and other attributes, you're only pouring water of a duck's back.

I generally keep to myself and friends. At most, I'll ask other patrons whether they are done with the machines. My reason is that it's Asian mentality to be hostile toward strangers even if a stranger offers advice.

How many times has a stranger offered small talk while you were waiting in a public place / in public transport?