Overall this is a yet another
"stupidest, least substantive thing one can complain about" type thread but I agree with Burj... to me it's fine for flight attendants to eat whatever's remaining in the un-selected Business Elite catering choices (since it'd otherwise go to waste) but it's really poor form to do it in front of coach PAX.
On a separate but related note, I'm not sure how they could do it, but FA's should be a little more discreet when they take a tray full of first class or B.E. meals to the back of the plane.