Croats use the Latin alphabet, while Serbs mostly use Cyrillic script, but they use a common language.
The government says Vukovar and other areas with large Serb minorities must have municipal signs in both scripts
Just look at how brutish they look. Jackbooted thugs should not be the ones to steer the course of democracy. Their uniforms are unnecessary as well and only serve as intimidation.
Croations themselves were also involved in war crimes, not just in the last conflict, but they sided with Nazis in WW2. (search term: Ustaše) Of course they will label their enemies as being Nazi-like.
Simon Wiesenthal had the following to say about them:
"Serbs saved Jews many times, Croats did not, i know that. We have always had sympathies for Serbs. They have written to me from the society of Serbian*Jewish friendship in New York, saying they could not understand why the whole world held only Radovan Karadzic and Ratko Mladic responsible for crimes in Bosnia," Wiesenthal told the review.
Of course just as when they were Nazi allies they persist on continuing the same mentality toward supressing minorities. They should find a way to coexist and heal, all sides have blood on their hands, to pretend they are innocent victims does not help in that process.