Here's a radical idea:  you are not your culture.
What if just stop constantly using flags, nations, religion, etc, and just focus on both seeing ourselves and others as simply the individuals they are:  Mike the gardener, Sarah the doctor, etc, instead of Mike the jew, Sarah the Bolivian, etc.  Constantly identifying with some larger nebulous group seems to foster various combinations of entitlement/resentment/defiance/etc, all of which leads to hostility.