Why do so many Americans misunderstand free speech and the 1st amendment?
Facebook banning you for saying something (anything) does not violate free speech or your rights. It's a private institution.
The government arresting you for protesting against Israel does in fact violate free speech and your first amendment rights.
You have no legal protection against social media moderators or mean words online. You're supposed to be protected against government persecution for speech that is covered by your rights
I agree that Facebook is a private company and may do as they please, though it is still harmful to free speech when a private company unilaterally decides what is and isn't "disinformation" or "hate speech" based solely on their political leanings.
As far as Israel... anyone who supports a designated terrorist organization (hamas is designated by USA, eu and many others) while in the USA absolutely should face justice.