Dumb question: it's about the actions of the believers. That's why the anti-vax kooks (whotends to skew left) gets a similar reaction to the creationists and climate wackos.
Granted that homeopathy stuff is ridiculous pseudoscience, but the difference is that nobody is trying to push it as a driver of public policy. When I shop at Whole Foods, it's for the tasty, tasty bread and local salsa and nobody minds that I walk right past the snake oil. I don't have a problem with creationism, I have a problem with it being forced on others. That's why we perceive it differently.