I hate the double-standard - if an animal bites, or growls, or hisses, or scratches, because it's being annoyed, or trying to communicate to a human to stop whatever it's doing - it's being "bad".

But if a human expresses the same thing (albeit, using English, which of course, animals cannot do), then it's fine and dandy.

Let's euthanise every human who tells another to piss off. What would people think about THAT?