So people who do not or cannot make a difference between those two kinds of nationalism, or can't even make a difference between nationalism and patriotism, are simply not educated enough. They just don't see the problematic of our times in all its nuances, but take things superficially. They see only black and white, where there are shades of gray. Patriotism is love for its own people and its own country, and is completely justified. You can't be an internationalist without being a patriot, and when injustice and aggression is done, you have to defend your country in a way you would defend any other country as well.
Patriotism is something entirely positive.
Nationalism could be present in some right parties, Seselj's or Draskovic's parties for instance, but in Socialist Party case we can speak only about patriotism, accepting other nations but at the same time readiness to defend interests of own, Serbian nation. It is entirely unjustified to say SPS was infected with any form of nationalism, and Milosevic himself can't be called a nationalist. His famous Gazi Mestan speech in 1989, was a completely anti-nationalist speech. Some people are calling it nationalistic, even without reading it. Or before this, Memorandum of Serbian Academy of Science - in the whole world it was considered a base of Milosevic politics, and called a nationalistic document which lead to breaking of old Yugoslavia.