I don't think it's just a refusal to teach that needs to be taken into light here, it's also a refusal to apease others. The same ethics can be applied to both situations, just different.
When teaching you obviously need to teach the cornerstones, I mean how delightful would it be if you could just make people learn by telling them to a do a backflip? Obviously they'd probably hurt themselves the first try and could very well end up a vegetable, "Clearly you should have started with basics, but you wanted to learn something flashy first..."
The other day I was refreshing myself on my vaults, a group of kids kept yelling "Do a back-flip you pussy!" Upon approaching them I inquired, "Why should I do a backflip?" "'Cuz it's cool..." "Well guess what, I can't do a back-flip." "'Cuz you suck *racial slur*," "Yes, in your eyes I do, but in my eyes I'm the master of practicality, and if I could do a back-flip, I still wouldn't do one, because I don't want to impress somebody who couldn't begin to fathom the training I've done." "Whatever bitch."
When I was done training I walked on top of a picnic table, yelled to them, did a backlfip, then I backflipped them off. Who was I trying to appease here? Obviously myself because I got to show them up, as opposed to show off.