Free speech is about the government not punishing you for your expression, not that all speech should be without limit or repercussion in general.

How would it possibly work if I couldn't be fired for insulting a customer at work, or telling them to shop at a rival instead. How would it work if news networks were required to broadcast my rant about whatever I want? Do I have to associate with the neo-nazi who wants me dead because I can't apply consequences for their speech?

I agree that this case is an example of unjust consequences of speech, and I think Blizzard did the wrong thing. It is not the same as being arrested and convicted for it, and it's not that simple.