Well, this is why dying is easy and comedy is hard. Once you touch on something people take as seriously/personally as race, there's the chance you're going to offend someone, even in a joke. I haven't read the fic beyond the excerpt, but I've certainly had people read situations in a way I didn't intend, and I think it's entirely possible the_moonmoth read this as 'Eames is being really racist here, and the author's just playing it for laughs, which I find offensive.'

But I also think people can honestly disagree with hir take without Aja having to come in and tell them how they're really supposed to be feeling.