The Hammers were beaten late on by Chelsea at Stamford Bridge.
Chelsea's Diego Costa scores the winner
The ever-controversial Diego Costa scored the Blues' winner in the final minute of normal time, having earlier avoided a second yellow card for what appeared to be a clear foul on Hammers goalkeeper Adrian.
The aftermath of Costa's challenge on Adrian
James Collins had equalised for the visitors with 13 minutes to go after Antonio Conte's side had taken the lead thanks to an Eden Hazard penalty shortly after half-time.
And it was the decision to field the perpetrator of that offence which had the West Ham supporters up in arms afterwards.
Antonio and Mark Noble track Chelsea's Hazard
Despite scoring nine goals in his first ever season at Premier League level, winger Michail Antonio was again deployed at right-back, with Sam Byram left on the bench initially.
Having looked uncomfortable throughout, Antonio was hooked by manager Slaven Bilic five minutes after bundling over Cesar Azpilicueta for a clear foul inside the box.
Hammers boss Bilic
Byram, a natural in the role, played the final 37 minutes in west London, though many were left fearing what impact the previous 53 could have on Antonio.
Absolutely love Bilic but his continuous mismanagement of Antonio is going to ruin what could be a very promising career for the lad. #WHUFC— Mitch Waddon (@MitchWaddon) 15 August 2016
Awful man management from Bilic. That will help Antonio loads. Should never be at RB, how he can't see that is a disgrace #whufc— Daniel Hennessey (@henn88) 15 August 2016
Good idea Bilic - let's completely destroy Michail Antonio's confidence by subbing him three minutes after an error. #WHUFC— Mitch Waddon (@MitchWaddon) 15 August 2016
Antonio was one of our best players last year on the wing. Complete waste of talent at right back. Bilic sort it out for Sunday #whufc— Dean Gray (@DeanoGee) 15 August 2016