Can't tell if he's saying this about RLM directly or if he thinks it's just a byprodct. If the former, he's wrong as RLM has sooooo many things they love. Heck, their most popular show is about finding the best aspects of terrible B movies!
And the Plinkett reviews are about as analysis-y as can be.
Bobby, being the very serious sycophant that he is, believes in his heart of hearts all this message board posting about Star Wars is all very important. He feels he's earned something for all this effort. Unfortunately for him, he's gotten very little recognition for all this "work" and hasn't even landed the deeply coveted NeoGAF virtual janitor position he's been gunning for. In his mind, he's essentially getting no credit for his deep understanding of Star Wars.
Now imagine being Bobby, the humorless self-satisfied person he is. Put yourself in his position of being the message board equivalent of a self appointed crossing guard no one wanted or asked for be keeps showing up anyway. Imagine how he feels when he sees all the views and recognition RLM gets for their Star Wars videos. How they're seen as an authority on Star Wars
while not taking it seriously. Imagine seeing the Plinkett criticism brought up in every NeoGAF thread about the prequels. Imagine how he feels when this stupid Plinkett character gets so much e-cred while Bobby gets almost none.
RLM doesn't take Star Wars seriously. They make jokes and poke fun of the movies, the fanbase and even Lucas himself. RLM is popular and beloved. This is the antithesis of everything Bobby Bartholomew Roberts stands for.
"Star Wars should be treated with dignity and respect" Bobby thought to himself.
"These films are serious business, dammit".

*gunshot. fade to black*