Free speech means believing in the freedom of speech you don’t like.
I don’t often agree with Noam Chomsky, but this quote is spot on:
“If you believe in freedom of speech, you believe in freedom of speech for views you don’t like. Stalin and Hitler, for example, were dictators in favor of freedom of speech for views they liked only. If you’re in favor of freedom of speech, that means you’re in favor of freedom of speech precisely for views you despise.”
— Noam Chomsky
This means we need to protect the right to protest, even if we do not agree with those who wish to protest.