Every time I watch that show and Celebrity UC, I am astonished by how bad nearly all of them are. As people always tell me, a quiz fiend, general knowledge and doing well in quizzes is not the same as intelligence. On any quiz, celebrity or otherwise, contestants always say they do fine at home and the studio pressure gets to them. Can you tell me how anyone else has done on that show?
There have been politicians, historians, Shakespearean actors, academics, newsreaders on that show foundering, panicking and generally being rather rubbish.
If he had gone on there and done brilliantly you'd still not view him or anything he does positively - you'd probably either dismiss the relevance or call him a know it all. This just gives you something to sneer at.
I have got nowhere very spectacular in life by being good at quizzes - 'too clever by half ',you see.