My honest opinion is that all this showboating cost the Cavs their season opener against the Celtics. Those guys used all that dancing last year as motivation this year and it paid off.
But, I really don't see anything wrong with it. Bron Bron is just being Bron Bron. If other teams have a problem with it then they can do something about it. That said, LeBron and the other guys who dance got to realize that while they may not feel they are showboating, the other team might and might use it as motivation against them. It might be fun just might not be wise.