You're your own censor in this situation and that's probably what the sentence was getting at.
I censor myself all the time. There's numerous things I simply don't want to read or see, but I've made and own that decision for myself.
Here's a devil's advocate point of view:
Free speech/free press is an asset within a group when the following are true: A) members are acting in good faith which typically requires value systems to be not too divergent, B) members agree on how to arrive at the truth, and C) members are not confusing science (designed to be true), opinion (designed to be neither true nor false), and entertainment (designed to be false).
When one of these is not true, it creates liabilities that need to be managed. Social breakdown is the result of not managing these liabilities.
Probably an initial response will be: "well who decides X" ... if we've figured this out for engineering problems where lives are phyisically on the line we can figure it out for this. Any authoritative action whether it be laws or standards make some portion of people unhappy.