When people are concerned about others freaking out, sometimes that is valid, especially in a crisis or potential crisis.
Someone yelling "all is lost" immediately signals A) they are not ready to help, B) they probably can't be convinced to help, and C) they want to convince you there's nothing to do.
It's very toxic because it tells you that people aren't going to help, work together, etc. They're going to freak out.
I think part of trauma-dump culture has made this far worse.
@StevenSavage I don't like it when people start shouting there's no hope, and nothing anyone can do. They're typically doing it to justify their own decision to do nothing in the face of hardship.