Since he'd rather not admit that having to ask himself why he believes what he believes and if what he believes is worth believing in terrifies him, he dismisses the whole scary phenomenon as being impractical and people who write fiction as pretty much making their money doing nothing much at all. It is thus that he tends to be a lot more fatherly to Gordon Mayes who works with machines and is thus sensible than to Mike who somehow or other isn't quite manly enough to work with engines like he should.
This unbelievable belief is as misguided and silly as all of the other delusions that bedizen the fatuous clot. Gordon, as a for instance, isn't animated by the same need John and Mike share to demean people to show them who's boss nor does he tell people that they need to lose the bothersome tendency to resent being called names. He also doesn't call the need to think of the feelings of those around him before opening his fat yap 'being muzzled' because he's not a spoiled brat. Since John sees things on a very superficial level, he can't see that Mike is far more like him that Gordon.