This hits the nail on the head for me. I get really irked on dis a lot, genuinely find it the most uncomfortable environment (but stay because the good and bad are pretty separate), struggle to articulate why that is but it is something around this combination of narrow-mindedness and some peoples willingness to be so harsh (I don’t like it when its aimed at me, or in principle when I see people do it to others).
Across a range of topics a familiar mindset will often emerge. People who thing they are the default, that what they like is what people should like, that what they experience is what others experience, that what they think is what people should think, and how they are is how people should be. When people diverge they consider it either treat it as a moral failing, or treat them with disbelief. Just some examples, you like a film they don’t think people your age should like so you are a ‘weird’ ‘pathetic’ ‘child’, you struggle with things they don’t struggle with so they think you are an attention seeker or that you think you are a ‘special little snowflake’ or that you are a ‘bedwetter’, you have a difference of opinion so they fire a personal insult at you rather than an argument, you like something they think is bad so you are pretending to like it or have ulterior motives, you dare get upset you are having a ‘meltdown’. Just really comes down to people not respecting other peoples personalities, views, sensitivities etc.
Think the judgmentalness, harshness combined with the often crude humour must be pretty unappealing to those who aren’t also like that, so they may not stick around to see the good stuff.