Idiots or combative?

I’m trying to figure out if a phone call I just had with a male nurse trying to input a referral was him just being an idiot, or actually combative. This is just an example and obviously not what I was asking him, but the conversation was like this:

Me: could you pass me the red pen?
Him: the blue pen?
Me: the red pen
Him: the purple pen?
Me: red
Him: the green pen?
Me: . . . Red one
Him: yellow one?
Me: Red…
Him: . . . black?

Eventually he went “oh. Red.” Then hung up.