If you read the original, it's much less alarming than polished makes it out to be:
"The longer you hang around the competitive world, the more you'll realize the extent of the politics, but you'll also learn how to play them to your advantage. That doesn't mean that you have to be a total sell-out, but there are certain simple things you can do to minimize the negative effects on you. For example, be nice to everyone, make a lot of friends, and don't speak poorly of anyone EVER (even your greatest rival, even though you KNOW he's nowhere near as good a dancer as you).
If you want to step it up a notch, it doesn't hurt to take lessons with other coaches. That's not selling out... that's being smart. And often, you'll find that the lessons are really good, too. Selling out is taking lessons purely for political purposes (especially when you know you're not going to get anything out of it). But if a lesson has educational value, take it. You will improve your dancing, and any political gains are purely coincidental."