I can't speak for non-Western countries, but "oriental" is considered to be a pejorative term because it is a "catch-all" term for Asian culture, when in fact Asian cultures are very diverse and can't simply be lumped together as "oriental." It was typical of colonial Westerners in the 1800s and 1900s to exoticize and demean Eastern peoples, practices, and cultures under the term "oriental." Edward Said's book entitled Orientalism (
http://en.wikipedia.org/wiki/Orientalism_(book)) is foundational to the understanding of "oriental" as a prejudicial term.
Basically, essentializing Asia and the Middle East as "oriental" is problematic. In posting this explanation I'm not trying to attack you or suggest you were doing anything knowingly wrong, but now you know why this word may be viewed negatively. I hope it helps!.