I find myself wondering: where is the line between meat to eat and meat to meet (aka people)? Are only homo sapiens people? Or Genus Homo? Or Subfamily homininae? or family Hominidae?
MaxPerson (I think) pointed out that chimpanzees were on the brink of extinction because of hunting. It is sold as bushmeat, it's legal and tasty for humans to eat members of the same family and subfamily (of the genus Pan). We no longer have an opportunity to taste other members of the genus Homo, but at the time this was a possibility, cannibalism was practiced within the Homo sapiens population, so it would be unlikely that we had reluctance to eat an Homo Neandertalensis. I consider a fantasy intelligent, bipedal lizard species to be at least as far evolutionary removed from fantasy human than real life humans are from real life chimpanzees.
The depiction of cannibalism by real-life colonial authors associated it to a deeply disturbing behaviour because:
a) they had no understanding of cultural relativism and thought that because in their culture it is taboo to eat your own kind, it must be evil (and not simply different) to eat your own kind
b) they were prejudiced against the native cultures because one of their goals was to spread christianity, so they demonized every part of the native culture (who actually did only practice cannibalism to a very limited extent) in order to emphasize the need to convert them and force them to adopt their (in their mind) superior values;
c) they were genuinely shocked because, due to lack of relevant knowledge, they probably had never imagined people could eat people as part of a cultural activity and not due to extraordinary circumstances like famine.
Nowadays, we have none of these handicaps and I don't understand them resurfacing when speaking of a saurian fantasy culture while we'd have no problem if we met a human cannibalistic society in an unexplored part of the world. Up until very recently it was supposed that the Andaman North Sentinel residents were cannibals and we didn't go out of our way to fight them nor did we consider them evil.