Please name the AP. He deserves to be named-and-shamed.
Last year a grad student tried to present her (practice) JMP in a lunch seminar at my department. One of the APs (who often does stuff like this) held her up for nearly 20 minutes on her *motivation* slide. He was quibbling about her interpretation of every related paper.
That's a real d*ck move. Leaving a seminar is not.
LK does this