"She used to be a cheerleader but you've always been an asshole, Sonny. So, your logic seems sound - shit's always coming out of that shit hole you call a mouth." she leans back with a smile. She has to play it off as just good old fashioned humor.
Sonny's always making some comment about her. Putting her down because she's a woman. She always likes to nip it. Let's him know she won't stand for it. Despite his position she won't let anyone talk about her like that, especially not in Church.