Why? Is it a big secret where meat comes from?
It’s just about being circumspect, your neighbour might be a secret raging PETA type and firebomb your house?
Whislt I agree that if it is legal who cares, but I prefer to not give people the opportunity to make trouble for me. The world is full of busybodies (as evidenced by the OP’s friend).
EG My husband got reproted to the police by a neighbour for shooting the airgun in the back garden. He was firing up agaisnt the shed into a metal pellet target catcher thingy that catches the pellets. The neighbour saw it from ther window and called the rozzers. Cue a dense PCSO on the doorstep threatening my husband with prison, when in fact she had no concept of what the legality of airifles and their use was. My husband coaxed her into the house and calmly googled the .gov page on airgun law.
But the issue here is that non officer types like the PCSO and civvy helpers at the cop shop put this on my husbands record as a suspected firearms incident, which when renewing his firearms licnese he had to explain to the acutal officers in charge. They all laughed about it, but it was till a P in the A.
So despite this really resulting in a minor admin issue for my boy to solve, who knowns what might have happened in the hands of some blue uniformed pillocks, or if the press decided to misreport?
Lesson – keep your business quiet..