I don't think it's just this website. The internet, especially in the last decade or so, has developed a tendency to cluster people and their activities into little bubbles. People are more comfortable with reinforcing their own ideas than challenging them or even accepting the possibility that somebody disagrees with them and isn't a complete moron or piece of shit. When you really can surround yourself with people who agree with you all the time, or at least who seem to, it becomes easy to take any disagreement as antagonism.

We also seem to live in particularly ideologically heated times. Whether that has anything to do with the internet or not I don't know.

Anyway I'd say that if anything Hubski is less likely to assume that disagreement means you're a troll or an asshole than other sites. Some people seem to get really upset about disagreement here, but from what I can tell they're in the minority.