Seth Rollins walked away from the biggest party of the summer feeling disappointed. Rollins, who lost his WWE universal title match against Finn Balor, took to Twitter shortly after Sunday night’s SummerSlam pay-per-view event to express displeasure with the crowd at Barclays Center in Brooklyn. Since he’s a bad guy, Rollins going after the crowd could be just another way for him to garner heat and build his character. WWE superstars frequently use social media for reasons beyond advancing storylines, though, and it’s likely Rollins really was upset, as the crowd at SummerSlam wasn’t too enthusiastic about his match with Balor, which actually e... NESN.com