To understand where Luka is coming from. This is normal in Europe and this is actually most successful coach in Europe history, leading several teams to euroleague championship. I don't think he would last long in US You can find countless more videos of his anger.
https://www.youtube.com/watch?v=gkMiCRfD6Og
https://www.youtube.com/watch?v=gkMiCRfD6Og