I'm genuinely shocked at how some people can so blithely, and possibly obliviously, throw out textbook pro-discrimination arguments when the target of the discrimination is something they don't happen to support.
At what point in this process do you think it would be been morally appropriate for you to cancel your service to this group?
Let say a local youth group submits a proposal to have their weekly meetups in your venue. They then begin to shoplift. What is the rational behavior to address this issue?
I would start by calling the police and report the crime. I could then start denying service to them (which casinos are known to do). But if I start to do general statements about any people which share identity, belief, political membership, or sexual orientation with the local youth group then I am likely stepping a bit to far into the realm of discrimination.
In a perfect world I think Cloudflare should have filed a police complaint in regard to the daily stormer and then canceled the account. Such decision would have nothing to do with regulating content, censorship, vigilante justice, or freedom of speech. It would just be a simple matter of a customer not obeying the law.