We're in such a state of things that people feel compelled to upfront state that while they don't support the thoughts of these sites, they support their right to free speech.
It used to be assumed that in supporting free speech one did not agree with the most vile of those expressions. Now we're compelled to say that up front lest someone conflate the two.
This re-interpretation of free speech is just as likely to come back to apply to the people now in favor of kerbing free speech.
One of the most obvious is religion and people holding views opposite to it. Or, what if you espouse Marxism. That could be incitement to violence, in this interpretation.
Today one groups is in control of what acceptable speech is. Tomorrow it will be someone else. And I will still be supporting free speech whoever is under attack by the contextual free speechers.