Answer:
The author's deepest message in<em> "They are made of meat" </em>is how a living being can pretend that another does not even exist and leave him alone, just because they have a prejudice towards them, provoking that the ignored living being remains in complete solitude.
Explanation:
In this text you can see how two beings from outer space are talking.
Both argue about human beings, referring to them as "meat". The idea of just thinking about having contact with a piece of meat seems ridiculous and horrifying.
So much so that they want to pretend that human beings do not even exist.
This is a comparison of how humans prejudge and make assumptions about other human beings without even knowing them, and instead of trying, we simply decide that it's better to pretend they don't exist.
Quoting the text: <em>"Imagine how unbearably, how unutterably cold the universe would be if one were all alone"</em>. This is exactly how the ignored person feels.
Human beings behave in this way, ignoring the one who thinks differently, the one who has another religion, the one who has another skin color, the one who has another social class.
And the profound message in this text is precisely that perhaps we are condemning to solitude a being who can become extraordinary, therefore people should judge less and interact more with those who are different.