Whether you're serious or not, I guess (most) strong shinobi would have to be masochists to a degree since they are always fighting or doing tough training in order to survive or become stronger. I don't think Madara is a masochist though lol
Madara just loves a good fight against an opponent(s) that can actually keep up with him. He's just really enthusiastic
I feel you bro. I thought the same thing when I first saw it. He really likes the pain. He's loving it right now, much better than what Hashirama's wood could do..