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Brandi Glanville is unrepentant this XMAS for the hateful text she sent Lisa Vanderpump -- in which she called her the c-word -- but Brandi's quick to add she didn't know Lisa's dog died.

Brandi was leaving a restaurant XMAS Eve with her kids when our photog asked about the text, in which Brandi wrote, "Merry Christmas vanderC*** and yes i am having my moment :) AND it's amazing!!! How is yours???? hahahahah #karmasabitch Or is it a c***?? Hahahaha."

Brandi told us she didn't know the text arrived just after Daddio the dog signed off, but she stands by what she wrote.