This is just the paradox of tolerance, if you allow everything you won't be free for long.
You are misinterpreting Karl Popper.
Free speech should only stop on those trying to attack free speech. If anything, it applies in reverse here.
> This is just the paradox of tolerance, if you allow everything you won't be free for long.
This. As a nice clear-cut example see the propaganda being pushed on how Haitians were somehow eating everyone's pets. Even if someone somehow ignores the extremist call for violence, the fact that this propaganda campaign was targeting perfectly legal and legitimate immigrants should be very telling.
Your example has nothing to do with the paradox of tolerance. At least not with Popper's version.
By the way, where was this meme pushed? TikTok? X? I don't think it has much to do with who controls a particular social network.