Geek's gotten a similar bug up his ass before. Because of my fear of anger, I generally leave it alone, especially if it's likely he's just irritated/ frustrated and overheating (feeling hot, temp wise, turns him into an asshole.) If it seems like something I should really say something about, I wait until he's stalked into another room and cooled off for a while, then I go in and ask "How did I handle that wrong? I'm sorry for [x], and want to fix it to do it right in the future. What did I do wrong?" The answer is almost always "It wasn't you, I've just been [x] lately for [reason.] I just needed time to calm down."