<p>“…what’s with the animosity?”
Well the majority of people here say there isn’t really any.
But if there is, I would say, per #9, it is a combination of egotism and turf protection/ resentment. They think other people are unfairly taking benefits that they think are supposed to be reserved for them alone. And they want to preserve their exclusivity, and their turf, as they see it. IMO. Not that they are actually necessarily correct about what is or is not theirs alone, but that’s another matter.</p>