I like it because it includes the implication that you're doing it to ingratiate yourself with people who are already your allies, and passing it off as bravery. That's more specific than insincere.
But this is HN after all, it's a relatively self selecting and privileged bubble. One man's bravery is another man's minor act of inconvenience.
Very illuminating.
I also take issue with the idea that "expressing opposition to racism" really counts as "opposition". Talk is cheap, particularly if you're rich and privileged, and even more so if you're rich, privileged, and your talk is uncontroversial. Opposing racism requires every day actions, some of them difficult or uncomfortable, not self congratulatory tweets and blog posts. And especially not self congratulatory tweets and blog posts from CEOs or venture capitalists.
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Person A: I'm facing discrimination in my industry.
Person B: I don't see color. Racists are bad.
Person A: Too bad I don't work for you. How can I deal with what is happening?
Person B: There's going to be more of this with Trump. I hate Trump.
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I related to this dynamic a lot.
edit: it was an interview of Asad Haider (editor of viewpointmag.com) on the last Behind The News (Doug Henwood's show) episode.