I think you can feel that Sterling is a terrible human being and still acknowledge that he has a certain right to privacy- just as any individual has a right to privacy, to not being judged for things they do that they've intended to keep private, to not have revelations of same intrude on one's life or threaten one's employment. Let he who would happily turn over the entirety of his Internet history for the last three years to his employer or school cast the first stone.
Others have pointed out that Sterling has a history of inappropriate behavior, and this may well be true. It also seems true that it was these particular comments, brought to light, that were if not the specific cause of his ban then at least the "straw that broke the camel's back", so to speak.
One can think Sterling is a terrible person- a "old bigot" in Olin's words- and still find the precedent disturbing. Principles worth defending are sometimes brought to light in cases involving awful people. The principles don't change.
I think Olin could have phrased this better- calling Sterling a "victim" sets my teeth on edge a bit, partly because we increasingly seem to be a culture in which everyone calls themselves a victim- but I'm not about to join a mob calling for Olin's termination or his game's boycott; that seems thoroughly absurd, and threatens to have a chilling effect on discussion of matters that do have more than one side worth considering.
To play extreme devil's advocate, though- the Supreme Court has ruled with increasing consistency that campaign contributions- money- constitute free speech... If, then, you have your income curtailed for stating your opinion, is your employer curtailing your speech?
(I recognize this argument is ridiculous, and I think the SCOTUS' rulings regarding political spending have been among the most partisan and abhorrent of the last few decades, but I can also imagine a lawyer making such a claim before a bench in complete, or at least mock-faced, seriousness.)