Well as someone who doesn't fit into that pigeon hole either, but spent a bunch of time on Gemini in the beginning of Gemini (and I might have written something you use on Gemini lol), I disagree with you. A lot of Gemini really is just culture in-group signaling. There's nothing "essentially white, male, American geek" in there but it does harken back to the cultural trappings of the early internet which was largely white, male, and American.

Moreover I don't see what's "objectively good" here, is it the gatekeeping of Gemini or is it the fact that Gemini is mostly just people writing about Gemini and digital minimalism?