I had a boss once who did this. I’d go with an issue, and he’d talk for ages then dismiss me. Funny thing was, he’d spend all that time telling me what a great job I was doing. Except that he loathed me and didn’t think I was doing a good job at all, and I knew that. And he knew that I knew. He just had the weird idea that if he soft-soaped me, I’d say nice things about him. What an idiot.