Have any of us not encountered all these? And more often than one would like, all four at the same panel? Plus ineffectual and even bad moderator?
"Four Personality Types That Will Derail Your Literary Event," described here.
What it takes to be a good moderator. Hint: it requires more than just showing up. A lot more . . . .
What isn't covered in the brief article is the effect of those dispiriting airless rooms in which conferences and conventions take place, whether academic or commercial. When all the participants are male, it gets even more depressing.