A) There is no hive mind. That’s just you perceiving a bunch of people who happen to hold a similar opinion as a monolith, and that’s an illusion. You have no data whatsoever to support the idea that they’re thinking in concert or even have the same reasons for their reactions.
Don’t take it so personally. They don’t know you, and they’re not attacking you by downvoting you. They’re simply expressing “I want to see less of this.”
d) Instead of having a kneejerk reaction when you get this kind of response and immediately being defensive, step back and use it as a reflective moment. Maybe you misjudged the room, misinterpreted the potential impact of what you posted, or are simply on a different track from those who downvoted. What can you learn from it? Do you need to change your own approach, or do you need to reevaluate your audience?