Theory: The reason Kylo Ren walks out in a huff after interrogating Poe, despite getting all the information he wanted, was because he looked into Poe’s mind and saw that Leia cared about him and kinda saw him as the son she always wanted. (Leia’s affection for Poe is canon.)
Even when you’re an intergalactic space supervillain, that shit has to hurt.
How else do you explain how pissed he is when leaves that room? Dude clearly saw more than he wanted to.