It is possible to have a civil discussion about things like affirmative action or immigration policy. Many reasonable people can disagree on those issues (racists just happen to have very strong opinions on these issues). You are being naive if you think everything that is labeled as racist on Reddit is part of a normal civil discussion. Subreddits like /r/Coontown and the many-headed hydra that pop up whenever those subreddits are banned are not looking to civilly debate these policies. They are looking to spread hate. Hate is not a political opinion. Hate is not worth tolerating.
I think you're getting closer to a more useful definition of "toxic" here than your original comment where you asserted "There is one clear side that is wrong".
The problem with this latter/original assertion is that you are at once acknowledging that there are "sides" and, therefore, a debate to be had but at once shutting it down as not worth having. Obviously, with this comment, it's clear you don't actually believe that, though.
> They are looking to spread hate.
Here's where I think you get closest to the root of what I think is the real origin of online toxicity. For lack of a better term, I think it's trolling for emotion.
I'm not convinced that even what you're saying, that they're looking to spread "hate", is strictly true, but I do agree that they're looking to invoke a strong emotional response, whatever that may be.
I'm pretty sure that some trolls don't even believe in the "side" they claim to support. The message doesn't even have to stand up to rational scrutiny, so it need not even have a true side.
> Hate is not a political opinion. Hate is not worth tolerating.
To the extent that such strong emotional response serves to shut down conversation, it's toxic, and I agree it's not worth tolerating.
However, I think it's dangerous to apply such broad labels, especially if it's focused on the opinions (e.g. racism) rather than the behavior (e.g. appeal to emotion).
The "they're looking to invoke a strong emotional response" echos the conversation on What Is A Troll on Meatball wiki ( http://meatballwiki.org/wiki/WhatIsaTroll ) which starts out with:
> Trolls generate emotions in others while not investing any on their own side. In real life you could not escape from the emotions of your peers — if they are angry you would be physically insecure so there is a BalancingForce, but in CyberSpace you can feel safe. Additionally electronic communication is known to amplify emotions. Those two features collaborate to make trolling so demolishing. When you analyze this phenomenon you need also take into account that very angry people have their thinking under an AngryCloud — so the troll with cool mind always has the advantage over the angry community members.
There's also a passage from Anti-Semite and Jew by Sartre. Page 13 touches on this:
> Never believe that anti‐ Semites are completely unaware of the absurdity of their replies. They know that their remarks are frivolous, open to challenge. But they are amusing themselves, for it is their adversary who is obliged to use words responsibly, since he believes in words. The anti‐Semites have the right to play. They even like to play with discourse for, by giving ridiculous reasons, they discredit the seriousness of their interlocutors. They delight in acting in bad faith, since they seek not to persuade by sound argument but to intimidate and disconcert. If you press them too closely, they will abruptly fall silent, loftily indicating by some phrase that the time for argument is past.
Should subreddits about thug-rap be worth tolerating? Do you think those lyrics spread "hate"? Are you equally vocal about those particular subreddits?