Earlier quoted context omitted.
This isn't quite Twitter, but I think Instagram is close enough: https://www.bbc.com/news/uk-england-merseyside-43816921 Teenager was found guilty of "sending a grossly offensive message" because she cited lyrics of a song in memory of a dead friend.
And yet, Jay-Z, or whoever made the song quoted, was able to release this lyric in the public without causing a problem. (I'm not saying this is right or wrong, because I don't know what the lyric is, but the double standard should trouble everyone.) Implicit in all this nonsense is a "right not to be offended" which is absolutely impossible to enforce and protect without Orwellian levels of tyranny, which a lot of p…
Context matters. Saying otherwise is either uninformed or dishonest. Performing a song containing "the roof is on fire" is different than just yelling the phrase. And yes, how others perceive your behavior is partially your responsibility. Just like people might kill you in self-defense if they perceive you as threat, even in case your gun was just a theater prop.
Regarding your "where is the line"... communication always requires interpretation and there will never be an "objective and consistent" line. I'm sure i could easily rewrite your example to fit a law of every country in existence. As for the US, I could go for "Defamation Per Se", in other words were implicit in all this nonsense is a "right not to be talked bad about" which is absolutely impossible to enforce and protect without Orwellian levels of blah blah blah
So yes, we will always argue about were line are drawn, just like others will try to overstep them without consequences. That's part of life.