Differentiation

Aristotle was 'right' within his own world-outlook - it all works together as an organic whole; his philosophy is his own perpective, his own intellectual biography, his philosophical memoir - same goes for Nietzsche.
Apply 'Amor Fati'.
Being 'wrong' means what? - having a different set of illusions to someone else?
Are your 'truths' more 'right' and less 'wrong' than mine?
Objectively? - but there is no 'objectivity'.
What is 'right' is just an error that has become common-place, and hardened into a 'truth' ... a stale one at that.
Aristotle qua Aristotle will be forever 'right', just as van Gogh's painting will always be 'right'.

Within Nietzsche's perspective, Master and Slave are differentiated by blood - How?. Because The Pathos of Distance means that the Master will not interbreed with the Slave, and vice versa.
This is the way Racial differentiation happens in Nature;
when Order of Rank is adhered to over generations.
e.g., the Greeks of Periclean Athens.
Relax the strict rules of racial hygiene, and then you get ... Modern Greeks.
To Nietzsche, the dysgenic mixing of classes and races had brought social, cultural, and philosophical confusion.
This is because one cannot escape one's genetic heritage; to paraphrase Horace - try to cast nature out with a pitchfork, she will always return.

That is why race/class are inextricably intertwined:
Once you have a serious Order of Rank, then even if you don't begin with a sharp differentiation of race, you will create one.

Nietzsche links blondness [in a certain historical perspective] with Nobility, and then to Aryans [i.e., 'the Noble'], who he claims were a blond Master Race who invaded Europe from the East.

Abuse is not an argument.
The Holocaust is your modern religion of Pity - that is obvious. One even celebrates their 'saints' and [holocaust] days, one has their God and their Hitler-Devil; as well as the Cabalistic number of the 6 Million.