My opinion is that they're not actually trekkies. They're Star Wars refugees who have worked themselves into a "I hate Disney for being woke!" ideological frenzy, but they have a desperate lizard-brain itch to watch as much Star Wars style violence as possible. They're trying to find an alternative franchise with pew pew lasers, and space ships going boom, and solving personal conflicts via fistfights and screaming, and angry buff soldiers firing sci-fi laser handcannons, for as much of the running time as possible. And they've latched onto Star Trek via the nu-trek violence-fests and mistakenly think that bullshit like the Picard series is representative of Trek.

I also think their lizard-brain itch for violence and their other bigotries are a big part of the reason they typically hate Lower Decks. LD has almost no space battle scenes, the ones that there are are very short and entirely plot-relevant, and the main character is a bisexual POC feeeeeeemale. They get angry that they're being denied the nonstop violence and white men like them being in charge at all times in all things like they saw in the Picard series.