Listen, the First Amendment guarantees you freedom of speech, certainly.
That freedom it’s protecting is freedom from *government* censorship. You are free to say whatever you want without *government* persecution. You are not protected from the criticisms of others though. And yes a person or company can refuse you based on what you say because they are not the government.
The First Amendment gives you a broad right of expression, but that means it also bestows a great *responsibility* to self-regulate the ideas and thoughts you express.
So, please stop claiming that this is America and you can say whatever you want and expect that to protect you from being held responsible for the words that tumble from your slack jaw.