Just because the Albanians were actually bad guys, doesn’t mean the Serbs were good guys. Rubio’s statement is still wrong however.
Serbs are the closest thing there is to normal, decent, middle class people in the Balkans and the albanian kosovars are basically a bunch of savages.
You need to read some history from before the propaganda began to fly. Here's a link to a post of mine which includes an NYT article from 1987 about the region. Please read it and reconsider.