I think playing college fight songs at weddings is a very specific WMW thing.
I can't confirm it because I've never been to a wedding in the South, but I suspect Southerners do this too
I have been to many upper middle class Mississippi weddings, although none in the last 10 yrs, but can confirm that this does not happen there. Also, this group is very strongly LSU oriented and donate large amts to LSU.
I have no Alabama associations but would totally assume they heavily theme weddings towards Saban and Bama stuff.