This topic reminds me of primary school days. It was okay to call each other names such as big head, mad, stupid or even more painful things like fat and dumb but never ever call someone a bastard. It was offensive, derogatory and mean-spirited.
That was a taboo and only a child spoiling for a serious fight would go in that direction. Discrimination by circumstance of birth is however not limited to children bickering and it remains a glaring reality in our society, despite modernization and development.