Check out the wide-audience forums (like on Edmunds). Because the spreading of misconceptions and false information draws lots of attention & participation, they allow the anti-hybrid people to continue their harmful posts. Keeping popular topics lively is their goal, hence having hosts rather than members than moderate.
There are a few forums specifically for hybrids that can actually be worse at times. Since their goal is promote a wide variety of types & brands, they allow some undermining for the sake of keeping the peace. Having one specific hybrid emerge as a clear winner would cause an imbalance, making the website appear to have a bias rather than being impartial. That would conflict with the goal of serving all hybrids.
Dedicated forums (like this one) are unquestionably the most productive & informative, despite the occasional misunderstanding originated from a newbie or someone intentionally causing trouble.