I trust his word.

He said his mind could never be changed on this?

You're spinning this into a dismissal, disrespect of Bakkot's intellectual capability or ability to reason. Yet disagreement does not equal disrespect when it is a matter of different preferences.

Spinning? I'm not trying to spin anything into anything. You said this was a matter of different preferences before, and I understood the first time. You don't need to repeat it. My criticism is about why you think this a difference in values rather than a mere confusion of them. (Also, "dismissal" has connotations, but I can't think of a better word to capture "throwing up your hands and going to war with them")

He is a [babykilling advocate]. He says he is a babykilling advocate. He says why. That I acknowledge that he is an advocate of infanticide rights is not, I would hope, offensive to him.

Emphasis was meant to be on alien. Aliens are distinguished by, among other things, not living in our moral reference frame.