There's enough for everyone why is that one running the other one away?

More than any other reason that animals will kill each other over mating rights motivates evolutionists to promote their theories. They seek to legalize the worst of animal behaviours as natural human behaviours. That hummingbird is probably bullying competition for the same mate.

Territory! Not just a mating thing! Every animal marks their territory!

Very territorial. Split your nectar up among 2 or 3 feeders ;)

Too crowded