> Oh! If there is some running joke here that I missed then I stand admonished
I actually don't even know if the person you replied to was making this joke, or if they were being sincere, I'm speculating... but...
> Is there a clip?
It was kind of a running joke on the show. Couldn't find a clip that encapsulates the whole thing, but the first clip here shows Stannis reflexively making the correction at various times as if it were like a tic:
https://www.youtube.com/watch?v=G0zNWswcqMg
And then later in the series you see it rub off on the person he was with in the previous instances (in the 2nd scene in this clip):