To be fair, quite a lot of real-world "collaboration" consists of one person doing most of the work, and then sharing the credit (whether willing or not) with someone else. I am very accustomed to telling someone the hows and whys and not seeing any acknowledgement signals coming back.
Real collaborations have a lot of tangents, and rabbit trails, and clarification requests, and elucidation sidebars, and restating what has already been established, and re-asking the core questions to see if they have been answered. If the other person is just nodding and saying "Mmhmm. Go on.", then that's no "true [Scotsman]" collaborator. It's a typical collaboration, though; there are two people in the room, and between the two of them, someone is doing the work.
Real collaborations have a lot of tangents, and rabbit trails, and clarification requests, and elucidation sidebars, and restating what has already been established, and re-asking the core questions to see if they have been answered. If the other person is just nodding and saying "Mmhmm. Go on.", then that's no "true [Scotsman]" collaborator. It's a typical collaboration, though; there are two people in the room, and between the two of them, someone is doing the work.