Yes, the Serbs were mistreated, especially by the Croats. That wasn’t the subject though. The Serbs wanted to mistreat the Croats, Slovenians, and the Muslims. And they were mistreating them. I would think that you would understand that since you’re a Holocaust survivor.
The Croats carried out some of the most barbaric atrocities against Serbs and Jews ever seen - made even the SS supervisors sick if I can paraphrase history.
If I was a Serb (and I am not a Slav or have any Serbian connection) and I saw Croatians resurrect the same flags and symbols and slogans as their WW2 Nazi puppet state I would fight like the devil to prevent being ruled by such people.
The same with the Muslims - and in fact the Bosnian ruler was an Islamist supremacist and last time Muslims ruled Christians in Bosnia the Christians were sold in slave markets. Same as in Kosovo. Kosovo post Serb control lives up to the hell hole the Serbs said Muslim rule would be.
At best NATO should have stayed neutral and smacked down both sides but in fact they backed the Muslims and the neo-nazi flirting Croatians.
By the way, in addition to former Bosnian jihadis, nationalist Croats carried out terrorist bombings in New York City and killed a few cops in the 70s as part of some anti-Yugoslav campaign. Serbs have done none of that against the USA and we bombed them for months.