Part of me thinks it's a matter of personal conviction. Yes, dancing can be used as a form of worship. But that doesn't necessarily mean that dancing is ALWAYS worship. I mean, we can use song as worship. Does that mean that whenever I listen to a secular song, it's worshiping something other than God? I don't believe so; it's not one of my personal convictions.
Breakdancing probably gets that stigma because of the sort of people one usually thinks of - low lives, thugs, troublemakers. Those are stereotypes, though. What's wrong about spinning around on a piece of cardboard? Are you prostrating yourself before a false god? I'm pretty sure that's not the case. Again, let me emphasize personal conviction. If God says to you, "No breakdancing," then don't breakdance. I have a personal conviction where I refuse to watch shows like "The Simpsons", "Family Guy" and "South Park". Others don't have that conviction.
It's a matter of why you're breakdancing. Are you trying to worship Satan? I doubt it! You're probably doing it for the fun of it. I don't see the harm in that.
