Comment by abalone

"Public service" is an important distinction here that you're missing. There's a big difference between opening a shop and running a telecommunications business. While it would be totally appropriate for you to set the tone and messaging of your shop and even discriminate among customers, I submit it would not be good for our society if telecom companies banned customers based on their legal speech. You wouldn't want that, because while it would be great if it only targeted racists and Nazis, what if it didn't? This is basic public communication infrastructure, just like the public streets that link up private shops.

The principle that applies is a basic Enlightenment one: everyone has the right to speak. You don't have to agree. You can not visit their shop. You can protest outside their shop. But you don't get to barricade their shop and cut its wires.