Uncomfortable about his comment

[Showboatbbb]

guy I’m dating and I were watching a tv show with an Arab character and a white character. We are not white.

Arabic character was quite terse with the white person and shouted at them. Guy I’m dating likes to interject / provide commentary when we’re watching things (generally quite witty but missed the mark this time), and said (in the characters voice): “That’s on you, you white bastard!”

I feel a bit confused why he even brought their race into it! That was not the subject of the show. I just feel uncomfortable!

is this justifiable? I did make a comment in response and he implied the character making the comment was racist but I really didn’t see it myself

If my partner were racist I would feel uncomfortable too.
Of course it is not justifiable

I am not white but I would find this offensive in the guise that if they had said ‘you black *’ …… works both ways

The implication was that he was speaking “as the character”. I don’t know what to say though, I feel weird about it