There are things that can be dismissed, and things that can be disproven. Some of the things that can be dismissed cannot always be disproven, as they lack anything testable or verifiable. For example, a child says that a dinosaur walked by three minutes ago. You could ignore him until he gets tired of trying to convince you, you could make a realistic statement in hopes that it will stop him from talking (dinosaurs died out years ago), or you could go the excessive route and provide detailed research data proving that no large creature left any evidence of travelling in the area within the last three minutes, including witness reports and traffic data. The last option is a decision of whether or not effort should be placed in something that can easily be dismissed. By putting an unrealistic statement into the same playing field as realistic scrutiny, it becomes treated like it's legitimate to a certain extent. The person making the claims can then come up with their own "evidence" or new claims and continue to believe them, making their lies stronger when challenged instead of being forgotten. On the other hand, too much of these untended and uncontrolled lies can cause a memetic effect, becoming part of culture as a set of irrational beliefs. So which deserve intense scientific criticism to refute every last detail, and which don't? Are there some you consider "mostly harmless" or should everything irrational be criticized and challenged?

New Age spirituality, Wicca, Paganism, Laveyan Satanism, Astral Projection, Kabbalah, Hermeticism/Rosicrucianism/Alchemy, Shamanism, Cargo cults, UFOs, Bigfoot, Snake handling, Cults, Scientology, Landmark Education, Ramtha's School of Enlightenment, Get rich quick schemes, business and financial scams, books and videos with false claims on health, business or nutrition, unproven alternative medicine, unproven medical products or procedures, unproven herbal and alternative supplements, conspiracy theories about New World Order, Illuminati, Freemasonry, Satanic cults, Jewish media/political/bank control, racist conspiracy theories, Holocaust denial, AIDS conspiracies, 9/11 conspiracies, Fortune telling, tarot, psychics, phone psychics, palm reading, astrology, newspaper astrology, chinese astrology, spiritual mediums, past lives psychics, psychic consultants, hypnotherapists, feng shui, quantum touch, faith healing, Chakras, Rastafarianism, Hare Krishna, Hinduism, Mormonism, Christianity, Judaism, Islam, Buddhism, Baha'i, Shinto, Sikhism, Jainism, local superstitions, superstitious beliefs, superstitious practices, superstitious social customs, superstitious laws, laws based on religious beliefs, folk beliefs, folk religions, tribal religions and spiritual beliefs, pseudoscience, biblical science, young Earth and creationism.

Anything else you'd add? Chiropractors are considered pseudoscience by some. Acupuncture and acupressure seem to work in some studies, and so do some herbs and alternative medicines. In this case scientific scrutiny would be a good thing. But then there are unfounded beliefs in altering chi, blood alkalinity, or exaggerated scientific studies to make untrue statements about effectiveness. Then there are products that are claimed to work beyond the current understanding of science, or are "waiting" to be proven, or claim to be part of large coverup/conspiracy that suppresses their effectiveness. Ionic water, ionized silver, magnet therapy, cancer and aids "cures." With some products, faith is more important to selling than science.