That's a good point. Reflecting, my moral compass frowns upon cannibalism, but I haven't fleshed out the reasons why. Hat tip for punching a hole in my argument

You made it specious, putting words in their mouth. They claim that, of the things they eat, plants and animals are morally equivalent. You added "but People!"

There is a HitchHikers Guide restaurant that doesn't server vegetables - because intelligent vegetable people outlawed it. They just eat sentient meat animals that offer themselves to the patrons. They even kill themselves.

The argument was that because both are alive they are morally equivalent. This is specious because humans are also alive, and are clearly not equivalent to either unless you accept that it would be acceptable to kill and eat humans. It's not as stupid an argument as "but People!", it's pointing out that they are neglecting other variables, such as the capacity for experience.

> They just eat sentient meat animals that offer themselves to the patrons. They even kill themselves.

If a human were to do this today, we would question their mental health. If it were a sentient cow, most people would see no problem with it. These views seem at odds with each other, no?