The stupidity lays in peoples lack in understanding of "Why" the buttswing cannot be used in certain ways, but also their lack of self control in general when it comes to anything in the game that goes against the rules. Even though it's a matter of opinion in this case, when it comes to the game, it's said that it should not be used in a bad manner, and that should be followed, so if someone ignores that they really get to suit themselves. The dance move itself though "Buttswing" is really not bad at all, I find it a good dance move that can bring quite a lot of derpy moments. It's just too bad that some lack the brain cells to use it well enough around other players which gives the whole dance action a bad reputation.
Without a doubt though, Headswing is my favorite due to it being more "natural" if I even may say that, but I do believe you get my point, but I would probably like the headbang more if it weren't for the excessive amount of hip motion, not really sure why it's there.
Just like any other user I wish for the day when we can get more animations and actions into the game since it would make a huge difference. Not to trail off the subject but you could see how big of a fuzz it got when we got some wings and an item system to use, I do believe everyone can imagine how big of an impact several new actions would have to this game. The dancing actions are used a lot by everyone since it's one of the things in the game that really allows users to have fun without sitting and modifying and creating maps and presets.