[Elmo]

The Dunlendings were the indigenous population of the area and the rightful owners of Calenardhon, they were there long before the Numenorians fell out of the sea onto the land. The Rohirrim were a colonial, interloping, land thieving population 'planted' by Gondor on Dunlending territory for military reasons, similar to what the British Empire did in various times and places in history. The Dunlendings were definitely right to be a bit annoyed about this and can hardly be blamed for their hatred of the horse folk, especially as countless of them were cruelly slain by the Rohan's kings like Helm Hammerhand who brutally murdered many of them like Freca.