The dumbest statement you've ever heard? Really?
So if somebody is overweight, you should definitely insult them and tell them so? If you don't believe in God and your friend's mother dies, you should tell them that, no, their mother is NOT in a better place, please stop being naive?
As much as I appreciate that your family probably should hash out some issues, that doesn't mean that every true statement should be said out loud. Sometimes it's okay to spare people's feelings or show a little class or just leave well enough alone.
In Nebrich's case, it would've shown more leadership to stay uninvolved.