That's because, overall, as the league table showed we're the better team and many fans were correspondingly confident.
Chelsea did what some teams do who know they can't compete standing toe to toe and just defend hoping to score at some point. Leeds did it with 10 men, united always do it, Spurs did it and Newcastle did it. No-one beats us playing attacking football as our owners demand we do as described by Pep in his interview with Ferdinand. PSG and Dortmund found that out as did Liverpool at Anfield. It's a unique club philosophy which will cost us from time to time.
So Chelsea did it and won and deservedly so. We have to find an answer to the parked bus and it's something we've been wrestling with for years. Fortunately, generally, we've been doing rather well.