Well, the "people who attack white men" are usually other white men and women.
Minorities seldom play any role in this game, except as objects of pity and protection for the white people who promote guilt and signal their woke status. When minorities do play a role, they are more often than not, the unrepresentative privileged elites of those minorities (e.g. highly paid journalists, actors, and so on) and not the person on the street.
Nietzsche compared the ethics of classical cultures (Greece, Rome) with Christianism that he called a slave morality, because in its first times it was adopted mostly by slaves.
The former admired strength, bravery and power. The later, summarized in the Beatitudes, was a subversion of those values. Nietzsche believed that Christianism weakened Rome and more or less caused its downfall in favour of barbarian invaders that had a morality more similar to the people that built the empire.
There are indeed many points in common with current situation. Despite their christian roots, current western nations, specially the USA, are based on capitalism, that values competition, strength, bravery, money, knowledge, power... much like classic Rome.
Then there are a number of social movements that attack powerful elites subverting all those values. Do all these movements necessarily weaken western civilization? I don't think so, but I'd say he has a point.
A world that is populated and led by the Last Man, who is tired of life, takes no risks, and seeks only comfort and security is not a world I want to live in.