Today's propaganda is hidden as organic voices of different organizations and you need to do some digging to see if org is genuine or someone is pulling the strings.
In retrospect. At the time it was taught as real history at schools. At least according to my mum, she never even found out about all the mass graves and other attrocities until after Yugoslavia fell apart. Partisans being the absolute good guys was just the accepted default.
I think this may be related to slightly different history - Poland was invaded in '39 by Russians as well and suffered fair deal of their atrocities - it wasn't possible just to eradicate knowledge about that.
Hitler then invaded when the new government said they were not going to collaborate.
Then as part of fighting off axis powers, we also fought an internal civil war between the communists and the ... I don't know if they had a real name, we call them the whites. It's details of that civil war that communist propaganda liked to sweep under the rug and talk only about how they singlehandedly saved the country from the nazis.
What kind of history you were taught at home depended primarily on whether your parents were Red or White. My dad for example was told a lot about the bad things the Partisans did because of his family's alignment to the religious, white, side.