I think someone is confusing the reality of relying on naturalistic science to learn more about the natural workings of our universe with with some sort of unreasonable dogma.
If, as Micheal Shermer put it, scientism is "a worldview that encompasses natural explanations, eschews supernatural and paranormal speculations, and embraces empiricism and reason.", then yes, I accept "scientism" as a valid and reasonable philosophy.
However, I think Student prefers the more critical definition of scientism as science having no boundaries at all, and that science alone will solve ALL human problems and that all aspects of human endeavors in time will be dealt with and solved by science. This is a more dogmatic philosophy rarely held by reasonable people, but often used as a pejorative by critics of science to describe skeptics of the paranormal and supernatural.