Loving Yourself, Your Way (ID 78724)
Loving Yourself, Your Way is an Alliance-only quest for level 10-90. It rewards 9,500 experience and money.
Description
If it's a challenge you're after, I think I have an idea.
I saw a boastful champion heading toward Goldshire. You could challenge him to a duel.
This would satisfy your desire and perhaps teach him a valuable lesson in humility.