Some interesting replies here.
I've had experiences with some cannibalistic groups, and it wasn't the greatest. I wasn't part of any groups, but way back in the earlier days of FH, my characters would encounter some cannibalistic groups.
A long time ago, me and a friend were doing a warrior roleplay by ourselves. Suddenly, this little group of clan cats came to watch us. Eventually they asked if their characters could interact with ours. They weren't just any clan, but a group of cannibalistic rogues. I didn't read their bios when I said, "Sure." So my "Yes, you can interact with us," was taken as a "You can attack and eat our characters without our consent." So they started RP attacking us, trying to kill our characters, and when we said we didn't want our characters to die, one of them was like, "Well you said we could interact with you." But that doesn't mean you can kill my character!!
So that's why I'm not too great with some cannibalistic groups.