>>151090261 (OP)
Because they're biased (and in more extreme cases misogynistic) but refuse to acknowledge that they are. Therefore they can't ever correct their behavior due to a lack of self awareness, therefore they perpetually act uncharitably or hypocritically
They take things that are personal preferences (e.g. I don't like a lot of swearing in shows), then use that as a guise to write off a show completely with their underlying bias being the real motivator behind their hatred of the show. If they actually knew how to critique or judge a show fairly, their critiques would involve more technical aspects of the show beyond normie surface level observations.