Obviously, but then it applies to the same code in those cities. I was referring more to cross code bitterness, I only seem to read about with regard to Hull teams/supporters.
Don't confuse having a rivalry with wanting the other club to fail, the local derbies give the fans one of the biggest and most important games of the year, underneath the 'hatred' there is a dependancy on these rivalries which is often unacknowledged by the fans.
Whilst the knuckle-dragging Celtic contingent cheered when Rangers went down, the more rational ones were understandably disappointed because their best two games of the football calendar had been taken away.
Obviously it is different with the cross-code rivalries, although probably less logical as neither team has any impact on the other.

. No one gives a **** about rugby league? Well my league loving friend you sure do tonight! You wasting your precious time claiming you know something of this sport yet having a go at fans of both codes who love the sports equally! Yes top hat I love rugby league, I love football!! As a kid growing up I mostly played rugby league but played football too myself, I enjoyed the physicality of rugby league and the technical skills of football.. You see just because two codes are very different doesn't mean they can't be enjoyed playing/spectating etc take off your rose tinted glasses mate 
My fav English import to play over here was Gareth Ellis, ironically he played for the Tigers in the NRL. Top player quick off his feet very agile was sad to see him return to uk. How's he going for FC? Wish him all the best