Hmm...I think maybe it's because it was'nt how Simon looked that was the problem,It was how he was acting and so obviously desperate for attention and fame.He was acting like a complete idiot.He did'nt need to act like that.It was his TV persona in a desperate attention hungry bid to get fame.
Jack seems like a nice lad who just has a weight problem.You can see it all the time and he does'nt need to highlight it,He more than likely has heard every fat jibe going and has accepted it and makes a joke of it before everyone else does.He's not acted like an idiot yet,Although there's still time yet