She specifically calls on white people to step up, take accountability and work toward "racial progress and unity" ... which simply starts with being vocal, not staying silent.
Rachael has a lot more to say, but concludes by telling people who are excusing or defending her past behavior to "please stop." She doesn't mention host Chris Harrison by name ... but, of course, his staunch defense of Rachael is why he won't be on the 'After the Final Rose' reunion episode.
As we've reported ... it was Harrison's excusing of Rachael's actions -- and historical racism in general -- that landed him in hot water and led to him apologizing and stepping away from the show.
It's unclear when or if he'll return to the franchise, but the controversy's clearly not going away anytime soon.
BTW, Rachael's post certainly fuels rumors Matt picked her in the end. So, now the question: is this mea culpa video intended for the 'Bachelor' audience ... or Matt?