Well, the issue was that the social media team working for the Yankees used this as an opportunity to take a dig at the Red Sox. Following each victory, the Yankees posted a picture on Instagram with the score listed as "Yankees X, The Team In Second Place Y."
I'm a big Yankees fan, but even I have to call them out on such immature behavior. You're the Yankees: you are the pillar of class in both baseball and sports. Your icons of Derek Jeter and Mariano Rivera never showed anyone up. Controversies would actually arise when players on your team would celebrate in a fashion that was not akin to the Jeters and Riveras (see Joba Chamberlain). Why is taking this shot at the Red Sox necessary?
The Yankees are better than this.