Russell Slade has criticised Leyton Orient fans for barracking his team in Tuesday's 1-1 draw at home to Oldham.
The result left Orient, who led League One for much of the season, three points behind second-placed Brentford, who have two games in hand.
O's boss Slade told BBC London 94.9: "It's sad that our crowd in the first half just didn't get behind the team.
"I find that so disappointing and then we even got booed off - some were even booing us at the end. It's a joke."
Slade suggested he had also been criticised by fans online, but said his side are not yet out of the race for automatic promotion.
He said: "The keyboard wizards are criticising me and saying we've given up. We haven't given up and as the manager I haven't given up.
"I'm frustrated for the players but they're a good group. We'll deal with it and we'll crack on.
"The work ethic and the commitment of the players is unquestioned."
Orient are at home to Bradford City on Saturday.