The reason we have specific protected-class carve-outs is because the default, outside of the need for protected classes, is exactly that. Private companies are free to discriminate except in cases where society has determined that discrimination is harmful to society.
Now, if one wants to have a conversation about the societal benefits of QAnon, or broadcasting information that is re-enforcing the President's overt attempt to thwart the American election for his own benefit, we can go through the front door and have that conversation. But if one wants to fall back on general principles of "Businesses should be required to associate with everyone, all the time, forever!" we quickly find society has never actually agreed with that line.
Now, if one wants to have a conversation about the societal benefits of QAnon, or broadcasting information that is re-enforcing the President's overt attempt to thwart the American election for his own benefit, we can go through the front door and have that conversation. But if one wants to fall back on general principles of "Businesses should be required to associate with everyone, all the time, forever!" we quickly find society has never actually agreed with that line.
No shirt, no shoes, no service.