If someone told you a blatant and obvious lie every day it would eventually piss you off. So I have every right to get upset. Creationist get upset because they've lived the better part of their life attending these moronic religious ceremonies where you pray every Sunday. For most Christians maybe every other Sunday or Holidays only. It takes an awful lot of ignorance and stupidity to believe in a divine Creator.
It's like a crack addict. You don't like crack addicts do you? Same thing with religious people, they're crack addicts. You shouldn't like them.
See, now you are confusing "Creationism" and religion. If I called you a moron for not believing in God, you are liable to get upset. Likewise, saying that my worldview requires ignorance and stupidity would bother me if your opinion were somehow relevant to me in any way. (Of course, saying one shouldn't like religious people is liable to get you in trouble one day.)
But besides truth being valuable for its own sake, and besides that fact that most Creationist arguments explicitly or implicitly villify scientists who deal in evolution, the fact is that the particualr brand of Creationism we all know and love tries to supress not only actual science, but other forms of creationism that stem from other faith views.