Enzo Maresca was roundly booed after taking off Cole Palmer amid Chelsea's ultimately fruitless search for a winner in their chaotic 2-2 draw with Bournemouth at Stamford Bridge.
The Blues should have won the battle between two of the Premier League's most out-of-form teams but were made to pay for some shoddy first-half defending, with both the result and fan reaction only heightening the pressure on the Chelsea boss.
Bournemouth arrived at Stamford Bridge without a win in nine but took an early lead when Antoine Semenyo's long throw was bundled in at the second attempt by captain David Brooks.
Both sides threatened with seemingly every attack but struggled defensively throughout the first period but it was a gift of a goal which brought Chelsea level.
Semenyo, perhaps in his final game for the Cherries , was penalised by a VAR review for a trip on Estevao inside his own box - and Cole Palmer squeezed the resulting penalty under Djordje Petrovic's dive.
The turnaround was complete with less than 23 minutes played when Enzo Fernandez evaded the attention of Alex Scott before rifling an effort into the top corner in a breathless opening quarter of the game.
It would continue as Semenyo caused more problems from long throws with Alejandro Garnacho, who had switched off for the first goal, guilty of allowing Evanilson the run on him to level at the back post four minutes later.
Few could take issue with captain Reece James' introduction at half-time as Chelsea battled for greater control, but Palmer's withdrawal for Joao Pedro with half an hour left to find a winner earned Maresca loud cat calls and ultimately did little to aid their cause.
Estevao's effort moments after that change would prove their only shot on target of the second period as the Blues' own poor run was extended to one win in their last seven games.
That left the hosts, and their beleaguered manager, subjected to more inevitable jeers at full-time - and Semenyo waving goodbye to the Bournemouth fans, perhaps for the final time.
Chelsea coach Willy Caballero, standing in for the 'unwell' Enzo Maresca, on boos following Cole Palmer's substitution:
"Of course, any supporter wants to have their best players on the pitch and we want to have the best players on the pitch as well.
"But Cole is coming back from a long injury, in this case we need to also take the way to find the right substitutions to go for the game, and also to keep our players healthy because we want to have them for the rest of the season."
Bournemouth head coach Andoni Iraola:
"It's not his last game here with us. I cannot say a hundred per cent but I think he will play.
"He has to recover, we've played two difficult games in three days. We have Arsenal at home, we get ready for another one, a demanding game against the leaders. Definitely he's going to be an important player for us."
