And as well as the reduction of social abuse via the reduced time spent with jackasses it can be a whole lot easier to tolerate social aggression if it comes from outside what you identify as the most local social hierarchy. If a Hufflepuff is insulted by Draco it may be a minor nuisance but if it was a high status Hufflepuff like Neville bullying them it would probably seriously damage their mental health over time.
And as well as the reduction of social abuse via the reduced time spent with jackasses it can be a whole lot easier to tolerate social aggression if it comes from outside what you identify as the most local social hierarchy. If a Hufflepuff is insulted by Draco it may be a minor nuisance but if it was a high status Hufflepuff like Neville bullying them it would probably seriously damage their mental health over time.