> I don’t really understand why this is so hard to accept.

I struggle with the same question. My current hypothesis is a kind of wishful thinking: people want to believe that the future is here. Combined with the fact that humans tend to anthropomorphize just about everything, it’s just a really good story that people can’t let go of. People behave similarly with respect to their pets, despite, eg, lots of evidence that the mental state of one’s dog is nothing like that of a human.