Fellow autist here, dancing is sort of based. Let me break it down for you.
First, good exercise:
>requires and practices control of trunk, especially hips, improves proprioception which is great in a society that sits down all day. see video for example which helped with my hip bursitis: https://www.youtube.com/watch?v=Pxsio9Wqsc0>low-impact, less risk of injury than other activities>OK cardio if you go hard, but either way some movement is better than nothingSocially, most social interactions can be seen as a game or a dance, both are good analogies/models:
>require tracking your own body position, and that of others>requires some synchrony, but each person can bring their own contribution>play sneaks in when people are enjoying it, like jokes in conversationI would LOVE to join some kind of Latin dance class, but I'm 33yo male and now the "just join a dance group bro" meme has been worn out and all the women would assume I'm just there to smell their cunts, or that I'm a fag. And it's mostly old folks anyway. Plus all the guys there are fags or looking for pussy, as previously mentioned.
And the sole purpose of festivals is to spread venereal disease, so those are out too.
To your points:
>it's a waste of precious energySo is literally all activity. Is it fun? If not, don't do it. If so, it's just as much of a "waste" as any other fun. Not a fan of fun? It's also good training in proprioception and social interaction (see above)
>looks sillyDo different dance.
>makes you stinkDon't be fat.
>all that bouncing gives you micro concussionsNo lmao, just don't jump a lot and don't be fat lol
>you are most likely dancing to judaic mk ultra cacophonyTrue. I only dance to barber beats vaporwave.
https://youtu.be/IIt86bLvTgM?list=PL8uL-Tq6CLOSB6h76nyE66UzDs0-N-cof&t=1471 
