Not sure about the smaller teams maybe Dungannon swifts, loughgall, etc. The big Belfast sides of Linfield, Glentoran, Crusaders and Cliftonville all mainly one side or the other. Cliftonville were banned from even playing Linfield at home for years. So basically Linfield had 2 home games against them rather than one home one away. Coleraine trying best to be a cross community club and only recently some guys been banned from our supporters club bus for sectarian chanting. They've been banned from other busses and also unable to book own coach due to trouble.