I don't recall Stuart being unpleasant to his fellow candidates, but I think he has to acknowledge that he did provide the ammunition to viewers.
I know that it's a heavily edited show which shows us the reality that it wants to show to us, and based on the reality that was presented to viewers there were numerous occasions where Stuart came across as arrogant and conceited. At least that's what came across to viewers through the prism of the edited TV show. (prism; not a pyramid or a tetrahedron)
Anyway, I'm not fat I'm just big boned. And I rarely eat Jaffa cakes. It's usually Hob Nobs or plain chocolate Digestives.