Leeds somehow managed to plumb new depths after last week's 2-0 FA Cup defeat at Rochdale and plunged the former Reading manager deeper into despair.
He will call all his players in on Sunday for a clear-the-air meeting after a fourth straight defeat dealt a huge blow to his play-off aspirations.
When asked if he could take any positives from his side's display, McDermott said: "Are you serious?
"After that, in a local derby, it's public humiliation as far as I'm concerned.
"It has to start on Sunday morning and I'll go back to basics with this team to do what ever we've got to do as a group.
"That was just unbelievable. It doesn't matter about being lower than the Rochdale game, that's just humiliating for all of us.
"I don't distance myself from the players because I'm part of the group. We've had a good run to get to 35 points, but we're having a poor time now.
"It's a terrible time for Leeds United, the supporters and us."
McDermott added that he was considering appealing against Smith's dismissal by referee Lee Probert.
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