I think the only way the issue would be solved is if people learned to exercise a little self control. Rather than either party discounting the other, the best thing would be if people were willing to listen to each other without the bashing. By all means voice an opinion, but try to do it in an intelligent, thoughtful way and if someone disagrees, do so respectfully.
I think creating a sub-forum may, in some ways, increase the animosity towards Parelli followers in other parts of the forum. And unfortunately, due to the lack of control exercised by some, I honestly don't think the bashing would stop. There are some people that would follow the sub-forum looking for a fight.
I agree with the above. As it is, I suspect that some "lurking" occurs in the NH forum as it currently stands.
I generally refrain from posting in Parelli-specific threads, although I do read most of them. Opinions are wonderful things, and everyone has one. What concerns me the most is when someone posts something and asks specifically that no one critique it, and people start bashing away. I'm all for spirited debate, but I'd also like to see that if an OP explicitly asks for critique-free replies or constructive PNH(or otherwise)-based responses only, that those wishes are honored.
It's a shame that we can't exercise a little live-and-let-live mentality on some of these topics. PNH is here to stay, and I have no more problem with my neighbor doing Parelli than I do if they do reining, jumping, WP, or any other discipline. Yes, there will be posts with advice based on PNH techniques, just like there are posts based on classical dressage, or reining techniques. So what? The variety of responses is one of the reasons that I'm a member of the forum. I can read what several training backgrounds have to say on a given subject and apply what "speaks" to me and to my horse.