Plus the fact that the general line of the Kilrathi empire is that humans are inferior, a prey species. And what do predators do with their prey? THey eat them. It would be a little more unthinkable for them I think if they did consider humans to be equal and such. Just like we wouldnt even consider eating them cause they are a sentient people. It would be murder basically.
Geez, not only do you gotta worry about the Kilrathi killing or enslaving your species and irradiating your planets, you gotta worry about them eating you too.
I think that they ate humans in special celebrations, not any day
(Ms Kat opens the refrigerator:Mr kat !!! what do you want to lunch human torso or human head???)
If it really is a part of a celebration, it may actually be a compliment of sorts... ritual cannibalism in human cultures at least, was usually about absorbing the strenght/brains/whatever of the warriors you killed.
I dont know if id be proud to learn that i was worthy of being eaten if when i died. Well i guess I would have reason to be proud, its just I dont ever want to be killed and or eaten.