Look at it from the other side as well. There are quite a few people that were active on this forum that have gone pro-lodo and prefer to discuss that stuff somewhere else.
What you say is true, Frank, but I think the point is how people should act, not where they should flee to, to find others who agree with them. I think this sort of behavior is endemic today, not just on this forum: folks embrace opinions (valid or not), promulgate those opinions "publicly", and then rail against those who don't agree immediately. "You must accept my opinion as high, absolute truth - I can quote sources who agree with me", or "you must accept my opinion; it worked for me", and eventually "Your way is wrong because it's not my way".
The medium itself makes this kind of behavior easy. It provides a soapbox, but it's also basically anonymous, so one can act badly without fear of embarrassment, and then just go away when the temperature gets too high. Unfortunately, well behaved folks tend to leave the scene too.
My advice? question everything (including your own opinions), but expect to be questioned back. "Don't be a dick." Remember that opinions are like a$$holes; everybody has one, but no one really wants to hear all about yours. And sometimes, when someone is being a dick, the best course may be to just ignore them ("Never wrestle with a pig; you just get muddy and the pig enjoys it")
-end of rant-