A hate-fueled attacker allegedly pummeled a stranger who simply glanced at her in an unprovoked attack onboard a Manhattan train over the weekend, cops and sources said.

Genesis Gittens – who just turned 20 on Monday – was yelling on a southbound L train at the 1st Avenue and East 14th Street station around 2:10 a.m. Sunday when a 28-year-old man sitting in front of her turned to look, authorities and law enforcement sources said.

Gittens then flew into a rage, repeatedly punching the straphanger in the face, as she sneered, “White boy” and “cracker,” according to a criminal complaint.

Genesis Gittens, 20, was charged with a hate crime after attacking a 28-year-old man on the L train in Manhattan on Sunday. Christopher Sadowski

The repeated blows left the commuter with a bloody nose,

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