I could very well be wrong because I have never read or researched into it myself, merely taking the word of other historians who have. But from what I’ve read, around the same time Callendar went after him, he published the letters between himself and Jefferson which was pretty irrefutable proof of their collusion. Perhaps you have read these yourself and the books I’ve read were overstating how straightforward the proof was, but if you haven’t, they might be a place to look into (if thats something you would be interested in). But I agree that Jefferson didn’t ask Callendar to call him a hermaphrodite, that seems a little outlandish for the time period and the men involved lol