While climbing, it's not an incapacity to discuss, nor necessarily a disinclination to engage that is at issue, but rather, as Bug later stated, a need to listen and consider well the words of another that can be a distraction. Of course, if the discourse is simply light banter, then there's no problem.
Up until a few years ago, I had my mind made-up about most things and was willing and able to cut through most arguments/discussions with ready answers and counter-arguments. Then, I had a paradigm shift in my head & heart and found I was more interested in asking questions than giving answers - that requires more concentration in listening to allow for discernment to have sway where quick judgment once reigned.
cc.com is fun for quick judgment based most wholly on literary license. There's very little facial expression or vocal inflection, only the written word - which is why I rarely use emoticons. I like the pure literary format for what it is.
While climbing, I feel I'm disingenuous if called upon to do more than joke or exchange light banter. So, perhaps you're correct in the assertion of disinclination, but perhaps for reasons other than you had assumed.