I remember one of my teachers from high school telling me that most males are born with autism. Is that true?

As someone with undiagnosed Asperger's, I'd say most do. It's an extreme form of the male intelligence. Any behaviour of which you'd say "that's such a guy thing" could be Asperger's.

Autism is more prevalent in males

That’s absolutely not true at all. Not even worth taking about

I think what she meant to say was that most autistics tend to be boys.

Wtf 😂

Dumb.

It shows more in boys.

My understanding is not that "most males have autism" but that there are probably more autistic males than females.
Even so…
[quote] About 1 percent of the world population has autism spectrum disorder. (CDC, 2014)[/quote]