I do remember seeing someone dancing in the spirit. This type of Pentecostal phenomenon is very rare but it does happen. One time at the Evangelistic Center in San Salvador there was a man who was hopping around in the spirit. He was standing over on one side of the auditorium with a few other people who were standing for prayer. Actually I think it was my Mom who pointed this out to me as an example of dancing in the spirit and not to say anything because of course it wasn't our place to comment on people's emotional outbursts in church. Who are you to comment on someone's personal experience? You are not inside their heads and don't what they are experiencing. Anyway, if something is out of order the pastoral staff is there to manage things, so it wouldn't be appropriate for us to comment on that. Did I myself not experience actual clapping in the spirit? So these things can happen although rarely.
Anyway, we all know your cousin David is no king. If he actually had danced in the spirit and someone had criticized that we could understand something. But we were not present at any such event and know nothing of it. The first that we hear a hint of this, the curses of Michal are being heaped on our heads. You only wish that I had said something you could use against me. But I do not need to explain the rules to you, about how you do not get extra credit for hanging out in nightclubs and dance halls, etc. Does not God call us to come out from them and be separate? To sin no more? To be holy as He is holy? God is perfect. We humans of sinful nature cannot quite reach perfection which is why Jesus came, so that we could learn how to really live.
Also, most people are not qualified to wear the uniform of the sumo wrestler of the Orient nor would performing that way be a requirement in this day and age. There is a culture where that type of performance is valued for whatever reason but that is hard for us to comprehend.