Serbians are not racist wll. You cant paint everybody with the same brush.
They're responsible for one of the worst genocides in the last 30 years.
They mercilessly murdered Muslim men and women of the same ethnicity as them merely 25 years ago and many still deny wrongdoing. What do you think the average person thinks of a Somali?
Obviously, not everyone is racist laakin its better to be safe than sorry:

Srebrenica massacre - Wikipedia

Why do you think Albania/Kosovo/Bosnia love beating Serbia in any team sport.