re: Kylin Hill is done playing for MSU until MS changes the state flag

My guess is because the CSA was a poorly mismanaged cesspool that no longer holds any sway in the eyes of the public. The Army of Northern Virginia however managed to actually do something of note by having several military victories despite the inadequacy of supplies and troops due to the aforementioned poorly mismanaged CSA.

The Battle of Chancellorsville for instance had Robert E. Lee's troops outnumbered by more than 2:1 and still routed Union forces for a major military victory.

The only thing for the South to be "proud" of during the Civil War was the Army of Northern Virginia. That was the only thing that the Confederacy had going for it. Everything else was a colossal disaster. That's why the flag is still in use today whereas the majority of people in the country couldn't even tell you what the CSA flag looks like.