I dunno why so many people were confused by that dialogue. It was awkward, but I still understood that it was a double meaning, and not just one or the other.
I think it was a poor choice of words for CIA.
Clearly, if he was going to say something and be interrupted by the last half of Bane's sentence, he should not have described Bane.
I don't think he needed a rebuttal about his ability to withstand pain from CIA to illustrate the idea that the audience was to believe CIA thought Bane meant for himself, and then amend his statement to infer that it would be painful for CIA.
Honestly, a facial expression denoting curious excitement from CIA would have been a better indicator that he was still interested in removing the mask, and it would have made him a more memorable character for a reason more positive than the interest of the internet in watching a dadcore dude get fucked by Bane, by giving the character depth and emotions, and a really twisted sense of humor.