You have to visit, OP. Some things will be different even though regionalism in the US has certainly decreased. See how you feel about the differences that remain and the culture of this particular school.
About the segregation in daily life: I find it to be much less prevalent all the time in the southern town in which I grew up. I attended integrated schools, but the neighborhoods and churches were still pretty segregated (by habit and economic class, not law). Now the neighborhoods and churches are more mixed. I am visiting home right now and staying in a hotel with a good sized African American clientele. I don’t share a hotel with this many black people when I go to NYC.(Hotel is same chain, same kind of hotel, much much whiter in NYC.)
Just an anecdote, just one woman’s impression. I’ll say again that the South isn’t as different as it used to be, but you will find some subtle variations and you have to decide if you like them or not.