Her bash got trashed.

A shocked parent wound up taking heat over her 7-year-old’s birthday party, where the only thing louder than sugar-fueled shrieks was the meltdown that followed — by another mom.

An aggrieved guardian complained that the host of what was meant to be a sweet celebration “made her kid cry twice this week” — while the organizer fired back: “She got a lesson on winning/losing.”

The b’day brouhaha kicked off after 10 invited girls started in on the games portion of the event — playing old standbys like Bingo, with one prize awarded per game, the event organizer recounted in a viral Reddit post . 4

One pint-sized party animal couldn’t handle landing any big wins, apparently — her tears giving way to sobs as the losing streak continued.

At one point, the birthda

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