Oh, it most certainly is. I've spent literally half of my life listening to (and combatting) the baitings and ravings of so-called "Racialists" who are really just a bunch of racists hiding behind semantics. You'll find so-called "racialist" theory in the teachings of the Church of the Creator (as found in Ben Klassen's "White Man's Bible"), Dr. William Pierce's "Turner Diaries", Tom Metzger's White Aryan Resistance, and in the songs of such popular underground "racialist" bands like the thankfully now defunct RaHoWa (which stands for "Racial Holy War"), Max Resist, and Bound for Glory.
When I see the term "racialist", all I see is a racist coward who hides behind Orwellian jargon in order to justify his hatred to the world at large.
Sometimes "separatism" it is not hatred but rather "cultural preservation". The Israelites learned this the hard way.
Law commanding Israelites not to marry outside of their people lest their faith become corrupt:
Exodus 34:15 - Lest thou make a covenant with the inhabitants of the land, and they go a whoring after their gods, and do sacrifice unto their gods, and [one] call thee, and thou eat of his sacrifice; 16. And thou take of their daughters unto thy sons, and their daughters go a whoring after their gods, and make thy sons go a whoring after their gods.
Them breaking the commandment:
Judges 3:4 - And they were left, that He might test Israel by them, to know whether they would obey the commandments of the LORD, which He had commanded their fathers by the hand of Moses. 5. Thus the children of Israel dwelt among the Canaanites, the Hittites, the Amorites, the Perizzites, the Hivites, and the Jebusites. 6. And they took their daughters to be their wives, and gave their daughters to their sons; and they served their gods. 7. So the children of Israel did evil in the sight of the LORD. They forgot the LORD their God, and served the Baals and Asherahs
And later again:
Ezra9:1 - When these things were done, the leaders came to me, saying, "The people of Israel and the priests and the Levites have not separated themselves from the peoples of the lands, with respect to the abominations of the Canaanites, the Hittites, the Perizzites, the Jebusites, the Ammonites, the Moabites, the Egyptians, and the Amorites. 2 For they have taken some of their daughters as wives for themselves and their sons, so that the holy seed is mixed with the peoples of those lands. Indeed, the hand of the leaders and rulers has been foremost in this trespass."
3 So when I heard this thing, I tore my garment and my robe, and plucked out some of the hair of my head and beard, and sat down astonished. 4 Then everyone who trembled at the words of the God of Israel assembled to me, because of the transgression of those who had been carried away captive, and I sat astonished until the evening sacrifice.
5 At the evening sacrifice I arose from my fasting; and having torn my garment and my robe, I fell on my knees and spread out my hands to the Lord my God. 6 And I said: "O my God, I am too ashamed and humiliated to lift up my face to You, my God; for our iniquities have risen higher than our heads, and our guilt has grown up to the heavens. 7 Since the days of our fathers to this day we have been very guilty, and for our iniquities we, our kings, and our priests have been delivered into the hand of the kings of the lands, to the sword, to captivity, to plunder, and to humiliation, as it is this day. . . .
10. And now, O our God, what shall we say after this? For we have forsaken Your commandments
, 11 which You commanded by Your servants the prophets, saying, 'The land which you are entering to possess is an unclean land, with the uncleanness of the peoples of the lands, with their abominations which have filled it from one end to another with their impurity. 12 Now therefore, do not
give your daughters as wives for their sons, nor take their daughters to your sons; and never seek their peace or prosperity, that you may be strong and eat the good of the land, and leave it as an inheritance to your children forever.'
Had the Israelites followed the above commandment their faith may very well not have become corrupted. But they did not listen.
In closing, it is important to rightly divide between "hate" and "perserving one's culture".