[roganartu]

“It couldn’t have happened to a nicer person” and other variations are usually used in a facetious manner. Basically, it’s sarcasm.

The people using this turn of phrase are effectively saying “good, he deserves it for being a bad person”.

[tptacek]

Yes, the comment here is noting the irony of how those words apply differently here.

[Taniwha]

yes, I'm a native english speaker, I was pointing out exactly that