A loner or social outcast is a person rejected by their peers because they are different, strange, inept or misunderstood. They are ostracized, shunned, avoided, excluded, and generally unwelcome. They are victims of bullying, character assassins and scapegoats. Their name is mud because of constant attacks on their reputation. Restoring their reputation is nearly impossible for no one cares whether it is true or not. People don't want to know them, be around them or have anything to do with them. When asked they are generally disliked, hated, seen as embarrassing or sometimes not even acknowledged at all. Their bad rep causes them not only to lose friends but have trouble making new friends. They may have a few friends but many of them abandon them because being a social outcast makes you one, guilty by association! Life as a social outcast is a very lonely one.
Joe: Tom is my friend.
Joe's Friends: If you don't stop being friends with Tom we will have stop being your friends! Tom is a social outcast, if you want to be one be his friend.
Joe: I can't be your friend any more Tom.
Joe: I don't want to be a social outcast like you.