In Chamber of Secrets when Harry confesses not knowing what floo powder is, Ron's immediate reaction is "Sorry, Harry, I should've realized." As in he, Ron, should've remembered that Harry's life is different from his own. No "you should've told me!" or "Why didn't you say anything?" The first thing out of his mouth is to assure Harry that he, Ron, is to blame here, not Harry for not knowing a thing that's everyday and ordinary to Weasleys.
Ron is an awesome friend