Seems pretty gay to put another person's meat in your mouth.
What's wrong with being gay?
As for the op question, no it's not hard to say if one is a vegetarian.
It is similar to the idea that eating horses cats and dogs is unethical, while it is perfectly ok to eat chickens, cows, lamb and pigs.
Also, it's probably not legal to eat human steak most places, but I wouldn't be surprised if there are cannibals somewhere on the planet at this point in time.
There was a case in South America when a plane crashed and they had to eat the dead in order to survive. It makes sense to me.