It means defending Nazi shit by claiming you're allowed to say anything you want.
Timmy: "I think it should be legal to kill Jews."
Moderator: (bans Timmy)
Timmy (elsewhere): "Help, I'm being persecuted for expressing my beliefs!" / "Moderator X is a fascist oppressing people based on their opinions!" / "Platform X hates free speech!"
You can see it even in the comments on this post about the UK. Most complaints about UK censorship don't say what was being censored. If Timmy said why the moderators banned him, his argument wouldn't even survive a cursory glance.
alt Hacker News
It means defending Nazi shit by claiming you're allowed to say anything you want.
Timmy: "I think it should be legal to kill Jews."
Moderator: (bans Timmy)
Timmy (elsewhere): "Help, I'm being persecuted for expressing my beliefs!" / "Moderator X is a fascist oppressing people based on their opinions!" / "Platform X hates free speech!"
XKCD covered this phenomenon years ago, but wasn't heeded: https://xkcd.com/1357/
You can see it even in the comments on this post about the UK. Most complaints about UK censorship don't say what was being censored. If Timmy said why the moderators banned him, his argument wouldn't even survive a cursory glance.