He complained loudly about first years never getting on the house Quidditch teams and told long, boastful stories that always seemed to end with him narrowly escaping Muggles in helicopters.
Reading a phrase like, Oh shut up in a text, instead of hearing it spoken aloud, makes it easy to misunderstand the speaker's intention - their aim, or plan of what they want to do.
The anxiously attached party typically complains — more or less loudly — that their partner is not responsive enough: they accuse them of being emotionally distant, withholding, cold and perhaps physically uninterested too.