So a few months ago I met a recent PhD graduate at a conference, working on a similar topic to mine. In retrospect, there were a couple of red flags which I decided to ignore at the time clocking them down as social awkwardness/cultural differences, so when they asked me if I'd be in principle willing to sponsor them for a postdoctoral fellowship in the future (think the ones where the institution has to put you forward, you cannot apply as an individual) I said yes - our area of research is niche in the UK and I absolutely want to promote it.
Recently they e-mailed that they'd seen a suitable post-doc scheme advertised... I told them we had an internal deadline, and could they e-mail me a draft proposal before the internal deadline so that I could comment on it. After that, the whole process has been so fraught and draining... it transpired that they didn't have an idea for a postdoc but rather hoped that I could help them identify one (which I did not), then submitted something that was woefully underdeveloped (no bibliography was cited except for my own work, of which it was very derivative - although I am one of very few people working on this topic in the UK, internationally I am certainly not the only one), then they asked for the internal deadline to be moved, when I said no because I wanted to protect research office colleagues they asked if it could be moved anyway, then offered to submit something "even if it's incomplete" (in a scheme with a 3% success rate? What's the point?). Every time I didn't reply within 24 hours or so they would e-mail again to reiterate the same question (even when we were 3-4 weeks away from the internal deadline so there was no real urgency).
At the same time they were citing multiple difficulties why the proposal was underdeveloped and late, so I suggested - why not take time to develop the proposal and target a forthcoming scheme or deadline? At this point they became quite passive aggressive, saying they'd put a lot of work in the proposal and demanding I identify a scheme for them or help them organize a conference on the topic so that the work was not lost. They also accused me of "leaving them hanging". Again because I didn't reply immediately there were multiple e-mails in that tone... I finally replied that I would not sponsor them in this round or any other schemes because I found our working styles and expectations to be incompatible. After that they sent yet another e-mail which I haven't had the courage to open.
Rationally I probably know I've done the right thing... but was I wrong to raise expectations early? I keep thinking, I should have said no when I saw the first draft proposal (it seemed to me extremely unlikely it could be turned into something competitive within 2 weeks... but then you never know, maybe there was a 0.1% chance or so), or even at the very beginning when it was clear to me there was something off. How do you manage aspiring post-doc expectations in the application process, do you feel you can 'dump' them at any point between agreeing to sponsor them and submitting the application if it becomes obvious you are not a good match?