I mean that I have no ethical basis for meat-eating. "Meat is delicious" is an argument from selfish hedonism, and I could not provide a credible philosophical justification.
If you're familiar with the comedian Louis CK, the basis of most of his comedy is that he understands how to behave ethically, to respect his fellow human beings, to improve himself and the world around him, yet most of the time he persists in perversely defying his better impulses. Singer addresses the same topic : it is entirely possible to be unethical - the sky will not fall, the oceans will not boil, you will not be sent to hell. But you shouldn't do it because it is unethical. But if you behave unethically, as all of us frequently do, the earth will keep on spinning.
I believe utilitarianism is, roughly, a correct framework for ethics (to qualify that, I believe that worrying over specifics of ethical frameworks is a rabbit-hole that you shouldn't head down, since most ethical frameworks will correlate heavily in terms of ordinal rankings of actions actually available to you in regular life).
A selfishly hedonistic lifestyle is unethical by almost any standards, certainly none I subscribe to, yet that is essentially how I live (I believe that most people are mostly selfishly hedonistic most of the time; I am no exception).
I could tie myself in knots trying to excuse myself from charges of hypocrisy, but I think I, along with most people, essentially am a hypocrite w/r/t my declared values.
If you're familiar with the comedian Louis CK, the basis of most of his comedy is that he understands how to behave ethically, to respect his fellow human beings, to improve himself and the world around him, yet most of the time he persists in perversely defying his better impulses.
Neal Stephenson's The Diamond Age takes place several decades in the future and this conversation is looking back on the present day:
I'm not sure if I agree with this characterization of the current political climate; in any case, that's not the point I'm interested in. I'm also not interested in moral relativism.
But the passage does point out a flaw which I recognize in myself: a preference for consistency over actually doing the right thing. I place a lot of stock--as I think many here do--on self-consistency. After all, clearly any moral code which is inconsistent is wrong. But dismissing a moral code for inconsistency or a person for hypocrisy is lazy. Morality is hard. It's easy to get a warm glow from the nice self-consistency of your own principles and mistake this for actually being right.
Placing too much emphasis on consistency led me to at least one embarrassing failure. I decided that no one who ate meat could be taken seriously when discussing animal rights: killing animals because they taste good seems completely inconsistent with placing any value on their lives. Furthermore, I myself ignored the whole concept of animal rights because I eat meat, so that it would be inconsistent for me to assign animals any rights. Consistency between my moral principles and my actions--not being a hypocrite--was more important to me than actually figuring out what the correct moral principles were.
To generalize: holding high moral ideals is going to produce cognitive dissonance when you are not able to live up to those ideals. It is always tempting--for me at least--to resolve this dissonance by backing down from those high ideals. An alternative we might try is to be more comfortable with hypocrisy.
Related: Self-deception: Hypocrisy or Akrasia?