More of a Yankee fan when I was young, which was kind of rare for a kid from Queens in the late-1960's / early-'70s when the Mets were the far better team. For some reason, I went with the underdog; and back then, that was the Yankees.
However, it was never a problem for me to root for both the Yankees and Mets. Back then, there was no inter-league play; and for decades, when one team was good, the other was usually bad. Plus my father and most of my family and friends were Mets' fans.
Still love the Game but not MLB as much anymore. Just worn-out over a period of years.
Between performance enhancing drugs (unregulated for years), free agency and no real salary cap (again, for years), the bull-shit 60-game COVID season (the bare minimum for players to get 100% of their salaries), the Commissioner and League being either unable or flat-out refusing to punish a championship team (Houston) that admitted to cheating and Analytics (UGH!), I don't watch very much baseball.
I actually prefer the NFL off-season to MLB and the NBA (many of the same complaints).