How far will you go?

Teachers, I have a theoretical scenario for you....

How far would you go for a student with a bad attitude? Say it's a kid that's very talented, but resistant, even hostile to criticism, and is disrespectful to boot. How far would you go to help and teach them? Where do you draw the line? What if the institution where you teach doesn't support you in your dealings with the student? Are you morally and/or ethically obligated to try to teach them, and to what extent?

I'm really curious to hear everyone's responses!

Thanks, Chris