Are the ‘straight Alphas’ who take great pleasure in humiliating and degrading fags actually straight?

I have a Master who says he's straight and to be honest he has very straight vibe. He's not even trying he just is like this. He takes great pleasure in humiliating and degrading me and he does this so good it's just unbelievable. He's 19 yo btw. So my question is, doesn't his kink make him not-so-straight?