can I make fun of croatians for being nazi collaborators or is this a sensitive subject?

Also is referring to them as croats insensitive? It feels like a slur tbh. If it isn't a slur can I call them scroats? Some croation on tiktok was valuing whiteness a lil too much so I made fun of them and wanted to make sure I wasn't being unintentionally shitty since I know little about this region

Edit: is croat pronounced krote or crow-at