[js1138]

That's what grades are for. Recommendations go beyond that or they would be of no use whatsoever.

That's why students go to professors they get along with. Same in working life. Not everyone is going to see you as your true, charming self.

[Nebullis]

That's why students go to professors they get along with.

Exactly. And this professor is upfront about his policy. He's not denying any students an opportunity for future studies.