Nobody said all Ukrianians are NxXxs. But the incumbent "Reign of Terror" regime which has ruled in Kiev since 2014 is dominated by them.
While the Russian propaganda machine certainly takes maximum advantage of this, that doesn't mean it isn't also true.
You only need to look at the extent of their promotion of the cult of Stephan Bandera for a start. https://scotlandtoday.online/stepan-bandera-the-hero-of-ukraine