Ah, I think the hangup for me wasn't so much not understanding that they had different info than me, but that they wanted the info I had. Moreover, that they might feel differently about things than I did, and they knew that, so I needed to make sure they knew how I felt.
When I see somebody just respond "K." or "Alright" to an invitation to do something, that always made me happy enough to know that they were gonna be there because I figured if they didn't want to, they'd have found an excuse to say no. I didn't suspect that others might not just assume somebody was happy to be there the way I did. It's helpful to know I need to clear up how I feel in some way for them to understand that I want to be there and enjoy their company.