Well-I know an Irish catholic priest living in rural countryside and he's fairly openly gay-so I'm surprised it's such a big deal in UK and in city as big as Manchester?!
I've always been a fan of Sean-he's not nasty, just honest..always has been. And please remember Sean has known Emily for quite a long time, unlike for Billy she's just an old lady from his parish. Emily can take much more from Sean than if he was some total stranger. Thats what made Sean upset too was that because he's known Emily for a long time and yet he felt that Emily didn't accept his relationship with Billy.