Freedom of expression should end when the right of others to be respected starts.
It is not ok in most of the countries of the world.
Certainly in the US when I was living there it was not ok to insult the President, note the president with capitals because for Americans there is only one president in the world and it is theirs. The President was a demi God, like the founding fathers, you better behave or else.
Probably this has changed with Trump and the WaPo, NewYorkTimes, The Economist and BBC all day trying to shoot him down.
I was a long time Putin critic but now after so long non sequitur, ab hominem, argumentum ad passiones Westerm Media coverage trying to create a new cold(or hot) war, I am starting to defend him.
Those newspapers used to be serious but they are taking the way of Reddit(that used to be as serious as HN). They are blinded by personal hate and becoming more and more war propaganda.