Yeah, I think there is a solution here.
Any time you are reading through a thread in which the Thread Starter, or probably anyone else posting in it, makes an assertion or claim with which you disagree, or offers instruction which, in your opinion, runs counter to conventional wisdom or known physical principles, then you should start your own Parallel Thread (use the original thread's title with a catchy suffix) and post your disagreement there. That way, the original thread will remain unsullied with controversy and conflict, with only agreement and high-fives, while you and your like-minded contrarians can post away, free from complaints of negativity.
What do you think of my solution?
That's the move.