I might be an outlier but I went to a tiny middle America liberal arts university that you probably never heard of, and work for a SV startup. And I haven't heard the topic of where people went to school come up a single time.
Even if that's true (it is), I have almost never had a meaningful conversation with a coworker about where we got our degrees from. Maybe that's because the conversation usually stops after I share my no-name institution. And in my current role I don't remember degree pedigree coming up once in any conversation.
If there's any lesson to learn from this thread I guess it's that no amount or level of credentials can overcome cultural biases, racism, and discrimination.