The tolerance for "gay people are evil" has, more than once, led to "gay people must die". In fact, it is an inescapable consequence - if you declare people evil, you do declare you want to rid the world of them.
And coming from that point: You are still free to say this, of course. And everybody in the Bay Area is free to say it, too. But there are consequences to your speech. And the consequence to this particular speech is that most sane people will shun you. Tough luck, Sam. We've seen your colors when you desperately clung to Peter Thiel, you've just shown a little bit more of yourself.
And yes, of course we must allow the free exchange of ideas. But speech that strips away the humanity of others is not "an idea". It's hate. And it cannot be accepted in a civil society, without undermining the very foundations of that society.
I find it especially amusing that he thinks "gay people are evil" is perfectly fine, but "biotech work is unethical" is something that really shouldn't be said. He couldn't be much clearer about his actual intentions: he really wouldn't like criticism of the things that make him money, and to not annoy the existing "talent", bigotry should continue to be OK.
Putting that half-baked kind of intellectual dreck under a Galileo quote is a truly Silicon Valley thing.