In one post about shebang (#) being used in Facebook and Twitter, the discussion was about crawling Ajax pages. I asked a question on good practices to make a Ajax site crawler friendly. It got downvotes! I was truly puzzled. The question was purely technical, non-controversial, within the topic, and extending the discussion. Yet, there were people (long timers with downvote power) trying to discourage it. They were acting exactly like toxic as you described.
In another post about Joel's statement of SO being more scalable than Digg, people were giving this and that explanation but ignoring the obvious elephant in the room - .Net was faster PHP. I made that statement and got downvoted to oblivion. Of course people here hate Microsoft, are into dynamic-type languages, and prefer open-source but a technical fact is still a fact. This just shows how narrow-minded people here are who can't tolerate diverge approaches to problems.
Oh well, if they want it to be a toxic playground, they get it.