So how bad is the divide in the north of Ireland?

My dad's mom's family has a lot of ancestry from presbyterians from the north of Ireland. (Obvioisly I'm not irish and never will be, not one of those) I'm American

Still i'd like to visit next summer, but from what I've read... it seems still pretty sectarian over there... not something I'd like to deal with personally. Maybe just stay in the south and enjoy the sights there instead.