I didn't say that the Commander's response was joking; I said that Braham's "Ka-Braham" (and, I would add, the immediate inclusion of jokes and comments of disgust from Taimi/Rox/etc.) were joking, and felt like a disservice to the moment. Further, I don't know if I necessarily agree that it feels 'authentically Braham', given that Braham has spent several episodes prior with a much more serious tone and seemed to be developing in that direction, but I'm sure everyone reads their interactions in a different way.
He responds to being uncomfortable with attempts at humor, just like a lot of real people.