Why do evolutionists hate creationism?

The reaction of societies to creationism is a complex one. While in itself creationism might have been just another subculture of various mainstream religions, the fanaticism with which creationists oppose the advancement of science and education through political means has caused a reactionary response in the more scientifically literate part of the populations of Western countries. One might idealistically claim to be opposed to creationist activism rather than to creationism itself, but the human mind is usually not that subtle, often resulting in a hateful stance towards the entirety of everything to do with creationism.