Marjorie Taylor Greene is going to bat for a Democrat … unloading on Laura Loomer over her attacks on Florida state Rep. Angie Nixon and accusing Trump and the GOP of enabling her “nonstop vitriol.”

MTG re-posted a nasty back-and-forth between Loomer and Nixon Sunday … saying she’s no Nixon supporter, but Loomer’s rhetoric went way too far.

Greene wrote, “I 1000% denounce Laura Loomer and her nasty, hateful, racists comments” … while accusing the Republican Party and Donald Trump of allowing Loomer to stay in the “inner circle.”

The exchange MTG jumped into got ugly fast.

Loomer called Nixon — who is Black — a “ghetto bitch” … and Nixon fired right back, mocking Loomer for eating dog food on camera before quoting Queen Latifah: “Who you calling a bitch?”

Loomer then doubled down, telling Nixon, “you speak Ebonics though, so maybe I need to bark at you and tug your leash and then you’ll finally understand.”

That was enough for Greene … who said Loomer’s rhetoric is not only hateful, but bad for Republicans.

MTG argued Loomer’s attacks hurt Republican Sen. Ashley Moody in her race against Nixon … and accused Loomer of “whispering nonstop insanity in the President’s ear.”

Greene also took a swipe at the direction of the party, writing, “This is Trump’s new MAGA and Republican Party and I want nothing to do with it.”