Update: I'm going to change my answer.
Corporations are people and have the right to speech, above all else, when it serves the plutocrats, hate mongers.
But they're godless oppressors of free speech whenever they refuse to serve haters, thieves.
Which is it?
Pick a side.
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No.
Patreon is protecting its brand. No different than Apple, Disney/ABC, Hobby Lobby, reddit, Hillsong. What you'd call "discrimination", because apparently there's a shortage of outlets for hate speech.
I also noted that brands are a proxy for trust. If Patreon bans haters, that's a signal to me that they are the kind of people I want to do business with.
Whereas I'm voting with my dollars. If I disagree with Patreon's choices, I simply don't do business with them. What the Freedom Markets™ call the market place of ideas.
But apparently I'm not allowed to make such choices for myself. Because Freedom Speeches™. My bad.
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Look at you, telling me that there are no ethics, morality. Just what's legal vs illegal. Aka might makes right, dog eat dog.