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Well, I kinda get it. We can tell kids how babies are made, but we don't have to go into certain details or say "Sorry Timmy, Mommy and Daddy are going to go try to make a baby sibling for you now!"
There's also the perspective that we should value animal lives and appreciate that we are choosing to sacrifice them for our privilege of enjoying their meat.
But yeah, this is pretty silly "outrage".
I mean, best way to get parents/relatives to shut up about you having kids is to describe the process in detail to them.
Just tell them you're incapable of having children, add a few tears and they'll never bring it up again.
When/if you get some, tell them you lied, and just wanted them to shut the fuck up, because it wasn't their business.
Is he the one who is slaughtering what he picks? Because making a show of it and having someone else kill it isn't so much better than a bunch of tweens pouting on social media. The tweens can at least claim ignorance