If I'm understanding Drifter correctly, and I admit I may not be, I don't think he's saying we should just accept it as the remnants of cultures past and turn a blind eye to it all. Rather I think he's saying that as part of culture past, it is still alive and kicking deep within most individuals on some level, though most strive to hide it, from themselves and others because they know it is undesirable, they don't want those thoughts/feelings, but it has been bred into them, and no amount of denial is going to keep it all down... everyone slips sometimes.
There are those who clearly don't fit the above description, not only do they have the thoughs/feelings, but they have no intention of hiding them, and wish to promote them in others... These people are a far greater concern than the above group, who may slip from time to time, but do so with no intent to perpetuate the ism.
To an extreme, it could be described as the difference between the little old lady who is cautious about walking down an alley because there is a black man stood half way down, and the little old lady who screams rape/murder/mugger when she gets half way down and he says "good morning"
I'm just guessing though.