Do I need to explain that copyright is practically unenforceable in the 21st century? Data is trivially copied and there's nothing you can do to fight that, no amount of laws will ever make it non-trivial again. Even if you successfully sue somebody for this, it won't stop them.
At some point people are gonna have to accept this.
For what it's worth, I didn't think it was rude. And I do think it was a substantive aspect of his response. It's a valid perspective even if I personally think it's somewhat orthogonal and incomplete.
I was replying to a similar sentence, but it is true that in the end it did nothing but escalate the situation. I apologize and yes, I will try to be more polite.
Well if you want to stick to the hard facts then it's even simpler: copyright infringement is not theft - those things are covered by entirely separate laws.
At some point people are gonna have to accept this.