Yes, this is the usual precanned retort when faced with the fact that one's fringe viewpoint isn't in line with the mainstram science. It's not an argument though, in that it doesn't tilt the balance of probabilities (from a Bayesian point of view) away from the initial prior (i.e. the fringe is likely wrong and experts are likely right - note that I said likely, not 100%, like a good Bayesian). If anything, his elementary mistake about Crick, his failure to stay up to date with recent findings about African DNA, and motivated agenda with roots in scientific racism are tilting in the opposite direction.