Redefining political violence has been a tactic of authoritarianism for many decades. It starts with only ever pointing out one kind of political violence (ie, the right does violence, the left does violence in response, only the left's violence is covered). Then comes treating lesser violence from one side as a greater form of violence (ie, the right is using grenades, the left is using boxing gloves). Finally comes what you experienced, the elimination of freedom of expression on the grounds that speech leads to violence, even if what you're calling for is just a slightly weird form of propaganda to invoke thought rather than any kind of violence.

I say all this in the hopes that someone on a different part of the scale somewhere can recognize the signs early enough to do something