I use this term since reading book "history of Quran", by Ingrid Mattson. According to her, that before Islam in the Arabic world there was always tribal wars.
For instance, my camel drinks water foe your tribe's wheel, so someone Killa the camel. Then I revenge my camel by killing someone from your tribe. Then the brother of the dead kills me whole family, then I kill your whole family+your friends, then you kill all my tribe, then my tribes friends to the same.. etc
She says once there was a 40 years war because of camels drinking water where they shouldn't.
Or I get lost in desert and die, and my tribe think it was you and start a war.
So, by tribal hate I mean that when someone makes an offense, this person is not seen as an individual, but rather the whole tribe is to blame.
I have the impression that this behaviour is still present in this region