Rudeness Everywhere
We don’t know who the original texter was, but we would like to say that they are the worst human being in the entire world. If someone’s father dies, you don’t just break the news to them via text message. At the very least, you should call them if you’re not willing to drive over to their home and break the news to them in person!
The OP has it right; the original texter was rude for delivering this devastating piece of news via a text message. Their response to the original text—“Took him long enough”—must’ve been one heck of a shock to read.