“Hysterical” is a loaded word that can have sexist undertones as a way to dismiss the opinions of women (indeed, the word derives from
hystera, the Greek word for “womb”). Meanwhile, Emma’s description of Dexter as "obnoxious” recalls the poor reviews he’s been getting in newspapers. Still, in spite of Dexter’s frustrations with Emma, his desire to maintain the status quo means that he never even considers ending their friendship until Emma brings it up.