[khedoros1]

They're trained on text that includes human interaction, and reactions to different tones of text. It makes sense to me that they'd react in a human-ish way as a consequence, whether or not the feelings are "real" as such.

[danielbln]

The "personality" you're interacting with is not really the result of pre-training, but deliberate post-training (RLHF, and specific system prompts).