There are several arguments to justify not taking part in a debate or trying to censor other viewpoints, which I will address in another post, but this post is only about this one particular "thought".
You hear this often from people who claim that there is no such thing as "cancel culture", and justify people losing their jobs, their positions, getting in trouble with the police and having a social backlash for saying that does not agree with their "progressive" views with saying "well, freedom of speech is not freedom from consequences". But. This statement is incredibly stupid if you spend just one minute thinking about it. And highlight what the issue is, here's a similar quote.
"There is freedom of speech, but I cannot guarantee freedom after speech"
Idi Amin
And just who is this Idi Amin? A prominent anti-racist, perhaps? A progressive icon of identity politics? An esteemed gender studies author?
Well... Not exactly. He is your stereotypical African dictator from the '60s-'70s with coups, murder, torture, child soldiers and fancy uniforms. (With a possible death toll of 300 000 if you ignore all the civil wars he was responsible for.)
I used to make the point that if the sentence in the title was true, in that case even Soviet Russia, Nazi Germany and East Germany had freedom of speech. After all, you could shout that "comrade Stalin can suck my dick" -you were absolutely free to do so. This is the logic of these people. The consequences would be there, obviously, but the speech itself was free. In the case of telling Stalin to perform autofellatio, it would be a bullet in the back of your head, but you can die in the safe knowledge that the speech was free. The consequence was there, though. This, as the real world example of Idi Amin shows just, an empty play with words. We all understand what freedom of speech means. Obviously there are limits -and it is always a matter of debate where those limits exactly are- but the whole idea is that you can only take part in the "marketplace of ideas" if you do not have to be afraid.
And "consequences" do make one to be afraid. Having to think of consequences when you try to say that trans women are not women does stifle speech. (I got banned from reddit for saying this. In Scotland you can get the police coming to your house if you post this. You can lose your job for this.) Having to worry about your family when you decide whether to say your opinion about something in your workplace, at your university, in social media is exactly the opposite of what the marketplace of ideas should be. It is self-imposed censorship due to the fear of consequences. In other words: the exact opposite of "freedom of speech".
