Calm down love, I wasn't being particularly serious. I don't find being xenophobic or racist offensive myself so I'm not arsed really. I'm not wrong though it's falsely said that Croats are Slavic. Their language is and about 30% of their population are bur most aren't.
Being accused of racism is pretty serious in my opinion.
Without sounding racist or starting a geo political arguement. I was under the impression the Slavic peoples were the main population of the former Yugoslavia. Southern Slavs being a general term for folk from that region. Where Central Europe meets Southern Europe.
Regardless, I do take offence at being called a racist.