Bendis has read a lot of comics. He's very well read in that regard. Continuity just isn't something he values highly, and he seems to often have a different view of what counts as consistency. But he has done the reading.
I do agree that that was an unearned moment that just felt regressive. I think Colossus suffered as much, or more, from that happening.
After Gillen's run, I get annoyed anytime Colossus calls Magik "snowflake".
Well, sounds incest-y. And also the wedding was, Guggs, well after Bendis left, so doesn't seem right to blame him.