I can't speak for Deighved, but I can cite some things I've observed.
There's a vocal handful of posters who strongly advocate Scott Frost as a candidate for HC. They make a fair case for him. Doc apparently has strong feelings against this, and believes that SF doesn't want to be NU's coach. I don't have a dog in that fight.
Instead of allowing that to be a simple disagreement, that handful of posters has taken to questioning Doc's background. They've questioned his background, and the veracity of his posts (all the way down to the weight of a particular type of domestic gamefish). It offends them that he won't give them the details which form his views.
They seem to be taking it very personally, and making it very personal. They chime in on the same threads. Doc is clearly feeling a little harassed, and I can understand why.
Those posters need to tone in down, b/c they're dancing on the edge of the board's rules. They're probably violating the rules with some posts, but almost certainly violating the spirit of the rules with many posts.
This may be what Deighved is referring to. The posters I'm referring to might be the "90s maniacs". I can only speculate.