British is a bit too global for those that stand either side of this divide: Polish lorry drivers are more welcome than those wearing the wrong colour stripe/living near the "wrong" river, in some parts.
(There was a lass in Aldi

, Cramlington tonight, wearing a Sundeland shirt and the security guard was stalking her.)
(For instance: Up the road ( 1.5 miles) in Seghill, where historically miners were brought in from Sunderland, they still support their father's team and have to be bussed to Sunderland on match days to get the coach/train to Newcastle on derby days to satisfy Police/security measures ...

)
I take it as light-hearted, but some strange folks are deadly serious about it.
Any "Mackems" spotted and good anti-"Mag" stuff?