YG, sorry you have to listen to this sort of stuff from anyone but glad you can ventilate here.
I think everyone who has suffered a terrible bereavement has had to listen to something similar at some point - the truth is that people literally cannot take in what has happened to you (lucky them).
Sadly the other side of the coin is that the people who are understanding have often suffered some ghastly loss themselves, as of course you know well...
I've had several awful bereavements, none as devastating as yours. Some of the horrible, insensitive things people said have never left me, but they have lost some of their sting over the years...and they taught me how easy it is to hurt someone who's already wounded.
A long winded way of getting back to the old cliche - what doesn't kill you makes you stronger...
All the best
xx