I don't feel like going back and looking the link up, but as I remember it, they said something like, "Let's post these jokes on TWT. 'You know who' won't like it, but who cares?" They didn't do it just to piss him off, they did it knowing it would piss him off. Still, whatever the intent, Ban could have expressed his outrage in a way that wouldn't have escalated the confrontation. I do see his point and I do understand how any ethnic joke could offend some people (even people not of that ethnicity), but he fed right into their expectations.
If someone posted something that offended me, I'd probably react just as Ban did, then delete the post and write something more subdued, yet cleverly sarcastic .