This is a late stage capitalism issue where too much power has been consolidated into the hands of too few, and so much as a single comment made publicly can blacklist you from participating in any cultural event for the rest of your life.
Think of how many radio stations, venues, internet channels etc have been bought up by megacorp.
We have all the bad parts of a Gibson cyberpunk dystopia and none of the flying cars or bio-enhancements.
It absolutely is. Freedom of speech means free speakers. If you're going to face petty punishments for the rest of your days because your criticized the "wrong" people then you are not a free speaker.
If you're serious about a free society that means you have to cop criticism, disrespect, and even mockery, most especially and particularly if you're in a position of power.
Madison Square Garden and its investors have the freedom to bar anyone they see fit on their own property. Their portfolios are only getting larger.
That’s late stage capitalism.
The intent of 1A is to protect the freedom of speech from those in power. The fact that non-government entities now wield the power to suppress speech doesn't change the fact that this is an infringement of free speech.