Meh, although the mages were rude at best deciding not to fulfill your role in a raid because you're not getting some food seems way over the top. Kicking these people seems the only valid option to me as they're delibirately trying to hold the raid back.
As for the mages, it is my experience that players in LFR tend to whine and cry a lot. If these people were crying and whining for a mage table I can understand their reasoning not to put one down until asked politely. I mean, I wouldn't respond to "OMG MAGETABL PLZZ!!" either. On the other hand, mine would've been down to start with the second I got in.
Join > Mage table > Go!
The faster the latter happens, the happier I am!