out of these three colleges : duke, rice, or Vanderbilt. whic has the least amount of racial issues?

My kid is a freshman at Vandy and the class is very diverse. I met lots of families at drop off and parents weekend and met lots with different backgrounds really enjoying mixing on campus. My kid does not plan to participate in Greek Life, Rush will be coming, so I cannot speak to that environment. Vandy seems to do a lot to make everyone comfortable.