I think you are confused. I'm a Yankees fan since before my first game at old Yankees Stadium in 1973. My point was that I rooted for the Mets two years ago during their playoff run because it seemed like a fun team to watch with the young pitching. Unfortunately for them they couldn't capitalize on it. I just don't see why fans from both sides have to root so passionately against each other when the chance to meet in a Subway series is so small. And I already experienced a win in my lifetime. Sometimes I think this negative karma effects Rutgers football. I have the feeling our fan base would be as bad as the Miami fans back in the day if we ever became a big time team.
Are you kidding ?
Do you think that Cubs fans root for the White Sox ? Or better yet, ask an old time (baseball) Giants fan if any of them rooted for the Dodgers when they both played in New York. Or if either fan base also rooted for the Bronx Bombers.
Or even better, how many Jets fans root for the Giants ?
Now factor in that the Yankees have been the most successful baseball team with stars like Ruth, Gehrig, DiMaggio, Mantle, Maris, and Berra and the Mets have been.....well...the Mets.
There may be a few fans who root for the Yankees AND the Mets....but that's just weird.