Samba Nazi
Someone who believes that samba should be danced, played or performed exactly the way they want it to be, and won't accept any kind of deviation from this. Additionally a samba nazi is completely absent of fun and humour and tends to shout and be overly serious when teaching or discussing it.
Person A: "That class was no fun at all, it felt like a boot camp, I thought samba was about fun and freedom?"
Person B: "Yeah, the teacher is a real samba nazi."
Person B: "Yeah, the teacher is a real samba nazi."