To be fair to Belfast (which has been the butt of criticism here numerous times) it did have its own Gay Pride Parade back in July without incident ... http://www.belfasttelegraph.co.uk/news/local-national/northern-ireland/in-pictures-belfast-pride-2013-29400570.html
Unfortunately for Belfast, it is the predominance of Prod and Provo Parades that get the most publicity there.