Boys are diagnosed with autism 4 times more than girls by age 8. There's a certain amount of supposition that this is due in part or largely down to "boys being boys" type handwaving, though my two nephews are on the spectrum and neurodivergent behavior in them presented as distinctly different from simply being energetic (one being almost nonverbal). Though it's possible, it seems unlikely to me that there isn't actually a difference.

However, the "greater male variability hypothesis" in terms of IQ scores is not terribly well supported by studies, and the difference isn't significant enough to account for the 4:1 ratio of autism diagnoses. As such, I imagine there's more at play here.