What reasons give rise to ethnic conflicts in a post-industrial society?

In a postindustrial society, conflicts can be caused by a lack of resources and a low standard of living. The world becomes open, people have the opportunity to compare their life situation with the life of people in other countries. That is, inequality arises, which becomes the cause of the conflict. Conflict can also give rise to simply hostility, for example, the infliction of offense from one nation to another in the course of historical development.