First let me say, this guy sounds like an idiot

I know on newborn puppies they put bands on their tails and they end up falling off, but not when they are 4-5 months old!
I hope you can talk some sense into him.

Just a sidenote...

The people we got Angus from used a butcher knife to cut his tail off So needless to say his tail was cut way too short and it never healed right