I think Black Panther is a cool moment in pop culture, but it's not some mankind defining moment. Nerds need some perspective.
And as for the Vávra thing. I wouldn't be surprised if the guy is casually racist, but I honestly doubt he is malicious. He's proud of his heritage and probably a bit of an asshole, one of those smart assholes. I don't know, I just doubt he's some extreme alt right neo nazi or something. How could he be? His arguments are against censorship and authoritative rule. Does he have some views I don't share? Probably, but I also don't have or know his background so I don't know exactly where he comes from.