IMO it's a loss for everyone to make mental health / disability a gendered issue. Mental illness is hard for everyone, regardless of what gender they identify as...
Also, I'm certain that there are male autistics who manifest their symptoms in the more stereotypically "female" way (ie, quiet, shy, reserved, good at masking), and by educating people on the different ways that autism presents itself, we can help those people get proper diagnoses and support as well.