As we know the cubs are the more popular team esp in my neck of the woods (literally) but I have to say that MOST IE 51% maybe more cub fans are pretty nice people, as a lot of my good friends are. In 05, I had 3 other people (cub fans) watching the Sox at my house polish off Houston and to be honest they were as happy as I was a Chicago team finally could hoist a WS trophy. But yes no doubt you have to consider them a rival despite the league differences..