You shouldn't call your sibling selfish
Richard and his brother Phil are playing and Phil asks Richard to share his toy, which Richard refuses.
Phil wants to respond to Richard's refusal to share his toy.
Phil tells his brother that's OK he won't give him his toys either next time he asks.
Phil tells Richard that he is a horrible and selfish brother who never shares.
Richard realizes that it doesn't feel so good to be on the other side and changes his mind about sharing.
Richard is insulted that he is being called selfish and begins to act defensively worsening the situation.