Knob was also very snappy with Auntie Cardboard when he 'rescued' her during the flood that he caused - He positively barked at her when she dithered about getting into the boat admittedly she would try the patience of a saint
I've mentioned before on these threads that he was vile to Johnny, and then sneered about him to Oliver (who, to my great disappointment, merely laughed in matey fashion when Knob said something hateful about Johnny bring dim and needing to be told what to do).
He's verbally dissed almost everybody he ever talks about, of course, although not in their hearing. He can't mention a name without saying something nasty, dismissive or contemptuous, or indeed all 3, accompanied of course by the famous laugh. The wonder is that apparently nobody else has noticed this and thought 'hang on, that Rob Titchener is an arse, isn't he? Why is he so horrible about everyone? He's a twat.'