I’m not sure if I agree that “humane consumption of animals” is a thing that’s possible. I appreciate this is a black and white view that doesn’t leave much room for nuanced arguments, but I’m ok with “it would be ideal if animals weren’t reared for the purpose of human consumption” as an absolute.
From that perspective I think it is ok to say that vegetarianism and vegan are more ethical than meat consumption. I also think it’s a defensible statement from an environmental perspective, because while food miles and unsustainable (plant) farming practices absolutely exist, things like dairy farming are so resource-intensive that regular consumption of e.g. beef and dairy are going to be hard to outweigh. Happy to be proved wrong on that point though.
Disagree on the chickens - not supporting the exploitation of animals for food production by not eating eggs is, imo, a more ethical position than supporting less harmful versions of the same thing.
All that I’ve written there looks very inflexible but I’m only applying it to my own choices, not dictating how I think anyone else should live.