
Ouch that rejection was way too harsh. He could have phrased it in an other way.
Other than that, I love the relationship between the brothers haha

I don't think he rejected him. I think he thought he was confessing his feelings for the MC, his brother. And that redhead was begging him not to fire him because he thought the manager would be disgusted with him and so he was disappointed that's how he thought of him. But I'm probably wrong because I don't understand how the whole thought about how 'if he were a woman' fits into that context.
I knew this would happen as soon as we saw how highly Kaneda thought of Yanase. No healthy relationship can work if you see your partner as way superior or a god like figure that you idolize.
He feel in love with his "picture/imagination" of who Yanase is, not Yanase himself so I can't blame Yanase for his reaction.