Rivalry matters in football though carheex surely ?
Of course, but it depends on each individuals definition of rivalry. For some it's all about trophy count, playground bragging rights, slagging off rival fans (even calling them 'scum'!).
I'm way past that though in my advancing years. For me, it starts and ends with excitement building up to the game, the added enjoyment that a game vs a rival brings, and (hopefully) the satisfaction afterwards. I'm 40 now and it would look a bit odd for someone of my age to be arguing with friends over league titles! That kind of rivalry is for the kids.