One wonders if even in the darkest recesses of your own mind do you not see the irony.
FYI, some of the most popular Pop bands and actors and models in Japan are all Korean. It's one of the big trends right now.
I remember back in the late 70s, they really seemed to like Cheap Trick.
I doubt it. I'd probably refer to them as 'japs' occasionally as well when writing, as it's much easier to spell than 'Japanese'. I wan tell you that for me, there is not a smidgen of racial animus in the term. It's just slang. I'd wager the same could be said of the poster. If I'd made the post, and you'd called me out on it, I'd see the humor in it, but not the irony.