Yep, heard a similar one the other day in Tokyo's airspace. A Cathay whale was impatient to climb but was blocked and he got snippy about a Northwest plane (perhaps a 757) that was cruising Mach .78 in front of him. It was pretty choppy around Fuji headed southbound so maybe it was for turbulence. Or maybe it's just contract time again. Anyway, instead of asking directly, the Cathay pilot in a haughty imperial voice kept prodding the controller to find out why NW was cruising .78.
Northwest finally had enough and announced "listen buddy, if we want to cruise .78, we'll cruise .78". Cathay probably got a nice long view of a slow red tail well past Bulan...