If you aren’t careful you can get yourself beaten up in any city in the world. Belgrade is no exception. In any case, the Serbs have no particular reason to like either Americans or Western Europeans.
Belgraders lit candles and laid flowers outside the French embassy in his honor. Belgrade also had a day of mourning for him and flew flags at half-mast.
That's could be more than many would have done in any Western city had something like this happened.