For years my husband could never understand why brothers and sisters he bumped into ignored him. He left the truth because he was a burnt out MS/Pioneer. He hadn't done anything wrong, he was just plain exhausted mentally and physically and couldn't do it anymore. He was never DF and he never DA.
It's only just now the penny has dropped that they were deliberately shunning him and still do.
He's had brothers look at him and turn their backs. It really used to upset him.