Sheeple is making a common mistake in thinking the 1st Amendment has anything to do with private citizens or entities stifling speech. It doesn't. The 1st Amendment only curbs government action. If there is no government action, there is no 1st Amendment violation.
So boycotting a business, shouting down a speaker, censoring a comment on a private website, etc. have nothing to do with the 1sy Amendment. Nothing.
Now back to your regularly scheduled programming.