I totally get that there's a difference between the scenario you're describing and factory farms. In fact, I've posited before that those animals would never have any life if there wasn't a demand to eat them at some point.
But the statement in question reads as "I don't give a fuck what happens to any animal". My question about pets wasn't meant to be tricky, it was trying to ascertain if the statement was an absolute or a general lack of care of where his food comes from.
What exactly is wrong with that statement, though? I personally do give fucks about certain kinds of animals, but I recognize that my choices as to what animals to care about is entirely subjective and is a result of my upbringing. I have no problem with a person who draws the line at "entirely no fucks given about any animal" (though that seems kinda sad to me).
Which... is also different from caring or not caring about malicious cruelty. And I think you could make a further distinction between being a proponent of cruelty (as in "I enjoy torturing animals in my backyard") and being indifferent to it (as in "I personally think it's gross to torture animals, but don't feel it's my or the law's place to force other people not to do it").
(Before I get labeled a monster, I personally think malicious animal cruelty is likely a sign of mental illness and am fine with legislating it away. Regarding animals used as food, I think ultimately we're finding that healthy, sustainable food production often aligns pretty well with increased animal welfare, but I consider that a bonus, not a hard necessity.)
Really, your question just illustrates the fact that this debate is entirely subjective and based on emotion.
As a further thought experiment, we're obviously already working on growing human organs for the purpose of organ transplants. Would people be ok with growing individual human organs for the purpose of food? I expect most people would think that would be gross and be against it, but ethically it seems in the clear.
The argument against this has nothing to do with Eloi thoughts and feelings, and everything to do with their ability to invade the Morlock tunnels and wipe them all out, as a matter of survival. That is, it doesn't matter if the Eloi object, if they lack the means to enforce their objections. Eloi thoughts do not carry any weight in Morlock arguments.
Besides that, feeding themselves to humans by the billions as captive domesticated prey species may be the only shot those species have at reaching other planets.
I think some chicken processors will use controlled-atmosphere stunning — or “gas stunning” — which desensitizes the chickens to pain before slaughtering. (that last bit was copy/paste from another source).