Kurotowa
Legend
I think the big complicating factor is fan communities. If you're a fan of something, and either it changes or you change and you no longer enjoy it, it's not the hardest to walk away. But if that something has a fan community, and you've been a part of the community and put down social roots, it's a lot harder to walk away from that.While I find the constant negativity of some fans exhausting . . . to be fair, they may not be fans of 5th Edition D&D, but are fans of older versions of the game. D&D isn't just a game, it's a lifestyle hobby that many of us have incorporated into our identities. So . . . to have something you love, live, and breathe change in ways that doesn't make you happy, can be a bit upsetting in a greater way than simply, "I don't like this new thing".
But still, those fans would better serve their own mental health by listening to Elsa and just . . . let it go. Continue to play the D&D you want to play, we are spoiled with options between the five major editions, all of the OSR and fantasy heartbreakers out there . . . the beauty of this game, this hobby is that you are EXPECTED to tinker with the rules, with the settings, with the lore, the tone and style, with every aspect of the game, in any way that you want.
People will try to hold on to the social bonds of that fan community that means so much to them. But that means constant grating exposure to the thing they used to love, which now brings only pain. And they reflect that pain back into the community as a stream of toxic resentment. Thus, the hate-watcher.