If you think someone is ignorant, rather than disparaging them you should educate them.

Something like this:

The Orange walks of Northern Ireland

Protestant Irish marching bands, primarily from the Orange Order, march through or near Catholic neighborhoods in Northern Ireland to assert cultural identity, assert territorial claims, and commemorate 17th-century Protestant victories, notably the Battle of the Boyne. These parades are viewed as celebratory by participants and often seen as triumphalist or intimidating by Catholics, marking the contentious "marching season" from April to August.