I get where you’re coming from. I do.
You have the right to yell “FIRE”. You have the right to enter as many crowded theaters as you want to.
Therefore you have the right to yell “FIRE in a crowded theater.
“Keep trying though.”
Back atcha pal.
Fail.
Ok, do you know where that example came from?
It came from the Supreme Court in Schenck v. United States, which came about in WWI due to a socialist printing out tracts that condemned the draft as immoral and encouraged non-compliance and the lawful alteration of the law. The Supreme Court ruled against him, despite the first amendment protecting that speech exactly, in order to avoid invalidating Congress's laws, much like they did in Wickard v Filburn.
The statement is a baldfaced lie: the proper response is to hold the shouter [if there was no fire] to be liable in civil cases.