It makes no sense. If bronies, furries, and anime fans are more likely to be autistic, then it would stand to reason that those of us who have no interest in these things are less likely to be autistic.
While there may be a correlation, there seems to be no causative connection.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.