It's always a shorter hop than people think from today's in-crowd to the gulags of the next group to come along.
Freedom of speech means that I can publicly criticise people for what they have said and done. Freedom of association means that I can choose whether or not to associate with people or organisations based on whether I feel they support me.
He has a freedom to say what he wants, believe what he wants, and donate to whatever campaigns he wants, according to SCOTUS. The Government cannot put him in prison for that.
Any company is free to choose to hire him, and any person is free to criticise that company and refuse to associate with them.
There are no freedoms being broken here, whatever you think. Which freedoms do you think we should not have? Alternatively, when do you think it is OK to exercise my freedom of speech?
Proposition 8 was not an expression of opinion; it was an organized campaign to remove and permanently deny to a subset of the population a right recognized as fundamental within the United States. There is no possible way to spin that as anything other than... well, that.