Grew up thinking I was kind of an equal fan of the Reds and Red Sox. Then when they played each other in the 76 series....nah, I was all Cincy and the Big Red Machine as it turned out. I think it was that Luis Tiante won game won in Boston...6-1 IIRC...and the Boston fans were insulting to the Reds. Something clicked...and I didn't really like the Sox anymore.
Of course, in the 80s, after yet another strike... I quit caring altogether.