In the Kosovo Conflict of 1998 - 1999 that saw Serbia go up against Kosovo which was a region that it claimed, hundreds of thousands of Ethnic Albanians fled the country and even though some came back, many lost their homes.
The Serbian leadership as well as many Serbs did not like that Albanians numbered so much in Kosovo because Albanians were Muslims and Serbians were Christians majorly. Kosovo to Serbia is a sacred place and so the leadership of Serbia wanted as few Albanians there as possible.
