No. In exercising my freedom of speech to say I don’t want to hear their trash, and I don’t want them harassing my users. Their freedom of speech doesn’t say they have the right to force me to listen to them.
(For people following along at home: the speech I’m talking about here isn’t a debate about appropriate fiscal policy, but about vile escaped-from-4chan trash. I’d never block someone for disagreeing with my politics. I’ll block their ass in a heartbeat for a timeline filled with swastikas and death threats.)