"Clearly, today's performance is unacceptable," he said.
"I'm not going to defend or try to defend today's performance.
"All of us who are paid by this football club to produce performances on the pitch have to take responsibility for that as well.
"But when I say I'm not going to defend it, I mean I'm not going to defend it on behalf of anyone here who's got anything to do with the playing side, and that includes myself.
"Whatever the reasons there may be for what people saw tonight, at the end of the day, they're not good reasons.
"The fans deserve more than that. They've committed themselves to the football club over the years, they've invested their money in it, they work long and hard to turn up here and what we gave them tonight, as I've said, was not acceptable, and all the more difficult to explain in some ways because of our performances away from home.
"Whatever the reasons, I would imagine people perceived a lack of commitment tonight, a lack of endeavour tonight, a lack of determination and so on.
"I'm not saying that that's the case because the players actually feel like that. They don't have a lack of commitment, but it doesn't matter whether they do or they don't have it, that's what people are saying, and you are what people see, that's how they judge you.
"If we're going to stay in this division, they're not good enough reasons."