BOSTON — New York Yankees manager Aaron Boone called it a sickness.He didn’t mean it this way, but what the Yankees displayed at Fenway Park during this four-game series resembled a dog vomiting on itself after eating something off the street. It’s only hours later that the dog’s owner realizes something terrible has happened.And terrible events did happen this weekend for the Yankees. They were swept by the last-place Boston Red Sox in a four-game series for the first time since 2018, dropping the series finale 5-4 in 10 innings Sunday night. The Yankees now return home for a three-game series against the Detroit Tigers, where they must figure out how not to let this embarrassing display snowball into something more catastrophic.“That’s what we do, baby,” Boone said. “You’ve got to love this stuff. You’ve got to eat this stuff up. It’s a sickness. That’s what the grind is. We’ve got a really good freaking team. We played crappy on this trip, kind of. It feels bad. Kind of pissed off, right? But it’s what we do. It’s what you signed up for. We’ll dig ourselves out of it and get it going here in short order. The bottom line is we didn’t play well this weekend, and we’ve got to do better.”The Yankees have dropped out of first place in the American League East and are one game back of the Tampa Bay Rays. They cannot afford this slump to extend long because a four-game set at Tropicana Field looms next week. Before Sunday’s game, Boone mentioned how he believes this season’s roster can be just as good as last season’s, which he believed was the best team he had going into the postseason.“I feel like we have a chance to be that team again,” Boone said. “Obviously, we want to get to the top of the mountain. That’s the ultimate goal. That’s also so far away. There’s so many boxes to check and things that we have to accomplish.”Here are three takeaways after a brutal weekend for the Yankees:Jazz Chisholm’s lack of accountabilityAnthony Rizzo strolled into the Yankees clubhouse before the game, and it was as if he still had a locker with his old No. 48 jersey hanging ready for him to wear. He dapped up his former teammates, hugged behind-the-scenes employees and even went into areas barred from regular media.Rizzo might now work for NBC, but he’s not far removed from still having many connections on the current Yankees. So it was at least notable listening to the team’s former first baseman speak about Jazz Chisholm Jr.’s ejection in the sixth inning Sunday night.Chisholm was upset after home plate umpire Adam Hamari said he went around on a checked swing, resulting in a strikeout. Boone acknowledged it was a borderline call, but Chisholm disagreed in the moment. The second baseman slammed his helmet into the dirt in disgust and was ejected.