Earlier quoted context omitted.
Bullshit is saying "We stand for free speech" and then later saying "the best way to deal with toxic and hateful viewpoints is to censor and hide them." Belief in free speech as a principle assumes that good and right arguments will win out every day in an open public forum.
That assumption is false. Things like racism aren't motivated by rational arguments, so they cannot be cured through a rational tool, like free speech. Racism stems from fear, hate, and deeply embedded cultural tools. You can't "cure" racism through argumentation. Maybe, maybe, you can make people less racist in person -- but on an anonymous forum like Reddit, not a chance.
Yes they are, because that is exactly what newly-insular racist communities will use to bolster up their ideological positions... Cherry-picked evidence that makes their position look rational.
The idea that no racist is thinking rationally is ridiculous.
To the extent rationality is what got them into their racism, that is exactly the amount that rationality can remove them from racism. By definition.