Re: Countries that censor social media, hmmm...
You would certainly be harassed by law enforcement, but as it stands in current court opinions speech becomes threatening when it is made to a specific person or group who are capable of acting on that threat and the speaker has reason to believe that they will take directions from the speaker. You have a sign in public that is not specific. That is protected speech. A crime boss says in the presence of undetlings "I wish the DA would go away." Not protected.