Please explain to me how it's un-American for a company to choose who they want as their customers? The typical Conservative position would be that businesses have a right to choose who they wish to serve, and denying service should not be an illegal act as their prospective customers can go elsewhere to find another business to serve them, which is exactly what those disgusting hatemongers did.
You are of course referring to this: https://blog.cloudflare.com/why-we-terminated-daily-stormer/
Why try to hide behind your words? Just straight out say you are angry at CloudFlare for ceasing to host violent neo-Nazi propaganda.