if it is something about a topic 'that only another guy would understand' then its a chick question.
1. Why do you constantly scratch your balls?
2. What is your fascination with "insert sport or type/model of vehicle here that they never play or drive"
3. What is it with men and always wearing a belt with long pants / jeans?
Does my arse look big in this?
Maybe it was a question that he thought the answer was obvious and the question was one you should know the answer to?
I'm just guessing here, but hear me out. Guys are super-sensitive to clinginess, as we girls all know. A guy in that kind of situation could possibly construe your question as an indication that you want to matter enough to him that he's told one of his partners. Or perhaps that you're about to get all girly and ask a bunch of questions like, how did she react, what did she say etc.
I could be way off the mark :)
My opinion is he is arrogant where women are concern,look what he has,all these ladies,why wouldn't he assume your question was unworthy of an answer. Treat him mean and keep him keen,don't let him thiink you need him.