For some time I was like you. Moved away from Southampton at a young age but had caught the Saints bug. I didn't particularly hate the Pompey scum until..... 1984!!
What a game. What a result. And what about the Pompey fans. My hatred of Pompey stems from that day.
My wife has a friend, sorry acquaintance who comes from Pompey. Doesn't go to the matches but certainly talks the talk. NYSaint just meet some of them. or go to a match at their shithole and you will understand the animosity .