For me, this is the weakest argument. Animals are not people, and agriculturally farmed animals only exist because of our actions. Cruelty aside, farming and eating them is hardly immoral (as it is evolved behaviour - we wouldn't be here to talk about it otherwise). The suffering of an animal is not the suffering of a human; and if suffering is our primary concern, there's plenty of human suffering that still needs dealt with before we worry about animals.
> In theory, you could draw some line at 'well humans and other more intelligent beings are different because they have dreams and a plan for their future'.
I don't have to resort to dreams and plans. They're simply _not human_ and so as someone who doesn't anthropomorphize them it's easy to simply not care whatsoever about their emotional state. It doesn't noticeably impact the quality of the meat.
I think there are a lot of oversocialized people who watched too many anthropomorphic movies and cartoons as kids. Some of them become sexually attracted to such, some of them just won't eat them anymore. Either way, it's a strange and divorced-from-reality way to go, seems to mostly have negative nutritional impact, and no difference is made in the world as less demand = cheaper meat = everyone else just gets more.