I dunno. When I see someone being rude to their dog, I know the dog doesn’t care. And, if we’re honest, I know it wouldn’t even matter if the dog did care.
But I still think less of them. I instinctively assume they have the same bad attitude towards humans.
And I think I’m right. I just don’t believe you could ‘practice’ at being a jerk that often and not have it bleed into your way of thinking and your understanding of “normal” interactions.