I think people often get very enthusiastic about methodologies that work for them and this gives them a sense that they understand it all because, "it works for me!"
That enthusiasm can turn to arrogance in some and then they start with the elitist attitude. I myself can fall into this trap too. I think that people have to do what feels right and works for them.
Different parts of PB have appeal to different people depending on their needs. I'm focused on the weight loss and diet, because that's what I need right now. As I lose more fat, I am certain that my focus will change to include more exercise, it already has.
Some people just like to argue and debate too. Give them a principle they believe in, (subject to their understanding of it) and they'll enjoy debating it to all comers. Hopefully it is done respectfully
Height: 5' 10"
Starting Weight: 292
Starting Primal Weight: 275
Current weight: 230
Goal weight: 172
Body Fat 27.5