As my dear mom, so wise, would say you do not know what that person is going through and why they are acting that way. David was bullied everyday as a child that caused him terrible anxiety and low self esteem it does go back
to your childhood. That's why it's important to keep yourself active, the
worst thing for persons who had trauma in their life.  Loneliness,
being ostracized, no one to talk to can cause depression and suicide.