I've heard very old people and actual neo-confederates call it that, but it isn't common.
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This was from a 21 year old girl from Texarcana.
Wow. I'm surprised a 21 year old knew that phrase, to be honest. That she had a misshaped view of Civil War history is par for the course, but calling it the war of northern aggression implies a certain involvement or extraordinary bitterness.
She's definitely a racist, albeit a polite one. I suppose that's the antebellum spirit alive and well.
Sons of Confederate Veterans/United Daughters of the Confederacy types use it. No idea how big either is in Texas, but there are plenty of them in the southeast still.