You could technically call Trump a shithead to his face and that is not unlawful. Where the Secret Service would (rightly) draw the line is at threats to his sa

You could technically call Trump a shithead to his face and that is not unlawful. Where the Secret Service would (rightly) draw the line is at threats to his safety (like if you threatened the president). So it's not true that you could say things on social media that you couldn't say in person. You can say a lot of things to the president in person ("you didn't get legitimately elected" "you're an idiot"). Now is that the best use of a once-in-a-lifetime opportunity? No. But it's definitely legal.