[Rhoda stops and thinks about it for a moment. Is that why all the dumb students at her old school would roughhouse and tumble and such? Rhoda never cared for such activities; she preferred keeping herself clean. That isn't to say she wouldn't play outside, but she always was very neat about it.]

That sounds like what the dirty students at my school think. [She says this with no irony, as if yes, of course this guy would understand and not be insulted at all.] They don't care about doing well. They just want to roll around in the mud like... hm, pigs.