or I've already graduated from Primary School
Or, you still don't get it.
It is a serious hatred between clubs and local rivals that goes back 100+ years.
You've grown up in a country that just doesn't understand hatred between local rivals.
Good ol' St Pat's Parramatta eh?
You really reckon Eels - Bulldogs fans hate each other like Liverpool - Everton do?
or like Newcastle - Sunderland -Middlesborough (all within 40 k's of each other) fans do?? Or even Spurs - Arsenal?
Leed's - Man U? There are multitudes more.
It's not 2nd grade stuff. It is a genuine fkn hatred.
Hate it if you like. Ridicule it if you like. Just accept the fact it is real.
I can't believe that you are so ignorant about these rivalries. It's all over Europe ffs!