There were a couple of good threads here ~18 months ago about "what is an HA." (And I opined at length there, so for now I'll just say "opinions differ--and that's OK.") Some folks' lists might include Sewanee or Hampden-Sydney, for example.
Washington & Lee has a crypt with a life-size reclining sculpture of Robert E. Lee (which is located in Lee Chapel). Lexington, VA is surrounded by places that saw fighting in the Civil War and the town is full of reminders of The Recent Unpleasantness. If W&L isn't southern, I can't imagine what would be. (And I say this as someone who's family has been in the south for 250+ years.
Maryland is below the Mason-Dixon line. So opinions might differ about how to define "the south," too. I'm ok with that. Just make sure your son contacts a wide array of schools if he's fishing in the D3 pond, because my experience was that there is almost no predicting which ones will show interest.