While I am grateful to Wilder for what he did for us, I never particularly warmed to his 'bulldog chewing a wasp' personality. But even so, while what he said might have been unconsidered, I think it has been taken out of context - as I recall he basically said that it was no good living on past glories and as far as our then-current situation was concerned, those achievements were meaningless. I never thought he meant they were 'worthless'. As someone who supports, played for and manages Sheffield United, I am sure he appreciates the value of a club's history.
He is still a grumpy old b****r though.