Self censorship is something even toddlers have to learn. They learn how to not blurt out that someone is fat, how certain words aren't appropriate for every situation, and that not everyone needs their opinion. The interviewees in this film seemed to skip that important life step and have come together in a 90 minute documentary to tell you how upset they are by being censored by their peers. They have all misinterpreted what the first amendment of the constitution actually is and the director obviously doesn't know either.
Prepare yourself to listen to misogynists (bitter about being fired for hate speech), priests, rabbis, and white supremacists (who they call "alt-right advocates.") Good luck getting through it.