Full Idea
Platonism boasted a bold reversal. He measured the degree of reality according to the degree of value, and said: the more 'idea' the more being.
Gist of Idea
Plato's reversal said the more value the more reality, and the more 'idea' the more being
Source
Friedrich Nietzsche (Fragments from 1886-87 (v 17) [1887], 7[02])
A Reaction
The second part seems to be a sliding scale of idealism. The highest values are the most real, but the Good in particular is very vague and undetermined. You then have the problem of people with unhealthy values.
Book Reference
Nietzsche,Friedrich: 'Fragments from 1886-87 (v 17)', ed/tr. Leiner, George H. [Stanford 2025], p.62