Its super rude and of course inconsiderate. Its highly not surprising though. I am a stickler for on time, and meet my obligations. I hate it when those that say they will do something or will show somewhere, do not, or roll in hours late. They then turn it around on you and tell you, to relax your too uptight.
Not my cup of tea. If I know those people are the way they are. I make the time, if they dont show up and are 5 minutes past. I go do something else. I always have a plan A, B and C with these people. I also stopped getting my hopes up or my panties in a twist. Burn me once, its ok. Burn me twice your on a list. Its a short one, and that person is not high on my priority ladder.
I have a very good friend that has a habit of cancelling minutes before, or not showing up to things for almost an hour late. She never calls, she rarely picks up the phone, and very rarely will text. Funny, though her phone works, and texts are flying a minute a mile when she wants something or wants to talk. So I gave up on her. If she wants to do something, she has to call and set it up. The I do the showing up, but never with out 3 other plans in motion. Now a days, and it happens every where around the world. Its a ME world. If I dont want too, if I dont like it, If I dont feel like it. Everyone else suffers. More and more people have lost consideration for others. I try my best to always cancel or call ahead of time, like hours if I can, I always try to be on time, or call if I will be late. Maybe once or twice in a LONG time do I completely forget something.
Death can be an excuse, because in grief you do forget lots of obligations, however if she died a few days ago and just made these plans with your husband, chances are he didnt forget, he just blew it off.