At the risk of speaking in generalities, I DO think native southerners are more preoccupied by the civil war than northerners. One example - my sister relocated to Atlanta and was being taken around by a local real estate agent. Over the course of the day they looked at many homes. At the end of the day the realtor told my sister she was "really nice for a northener." It was meant to be complimentary. I KNOW a similar thought would never occur in a reverse situation because northerners don't think that much about it.
Also have a friend in the construction business and they got a bid to build a structure in NC. Apparently local workers were unhappy that bid went to outside company. They could not get any local contractors to do any sub work. Brought in entire crews from NY to do the job. (Yep - that sure showed them northerners..........).
Guess all I can say is that if any southerners DO harbor any bad feelings towards those north of the mason dixon line, the converse is certainly not true. I like the south and hope to relocate there some day. My only concern in doing so is I probably won't get to burn coal down there