Nerd culture, like many other subcultures, are very different and varied between groups of people and where they chat, and those that were saying that this episode was going after "all the nerds and all the Trekkies", are trying to encapsulate a subculture that cannot be categorised so neatly. This ignores the fact that it was specifically making fun of the entitled, rude nerd the ones that use their online persona to bully others and compensate for real-life frustrations.
Black Mirror YMMV Series Four USS Callister - ArkAngel - Crocodile - Hang the DJ - Metalhead - Black Museum