Mayor Bill de Blasio said Friday he's "really angry" at the Muslim student who cops say lied about a bias attack on a Manhattan subway — because real victims will now be met with more skepticism.

"I am really angry at this young woman for, in effect, doing a huge disservice to everyone," the mayor said, speaking of accused hoaxer Yasmin Seweid during his weekly call-in show on WNYC radio.

Seweid, 18, of North New Hyde Park in Nassau County on Long Island, admitted to cops Wednesday that she'd made up a story of being accosted on a subway on Dec. 1 by three white drunks who called her a terrorist, taunted, "Donald Trump!" and tried to pull off her headscarf.

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