Mel was unhappy about his side's defending in the first half and felt, if they had started well, they could have left south London with only their second away win of the campaign.
"I'm extremely angry," he said.
"In the first half we really did gift it to Crystal Palace, the first goal was from a second ball and the second goal came from a corner.
"I really would like to know [why we started so slowly] but if we had played like we did in the second half we would have three more points right now."
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