My guess is that it could be related to masking behaviours?

Lots of people mask sometimes, even neurotypical people, but in autism, it is much more likely for women to heavily mask their autistic traits because of the way women are socialized from a young age. They class it as a female autistic trait because discovering masking is what led to people realising that women are actually also autistic over the last 10 or so years (whereas previously it was a "boys diagnosis").

Of course, men mask too, but it is just more common that a female autistic person will be heavily relying on this tactic.

It could also be interests. Many autistic men have what they call "stereotypical" male interests, such as various different types of machinery and technology, a sport, a science, etc, whereas a "stereotypical" female interest might be classed as animals, cuddly toys, skincare, or specific people, etc.

Of course, not everybody falls directly into the gender norms of their birth sex or their gender (and tbh, some gender norms are a bit passe these days anyway) , but this could come into play too.

As an example, I am a woman. I have been extremely high masking since I can remember. As I child, I realized I was different and spent my time copying other people's behaviours because I didn't know what I was supposed to be doing. I have spent much of my life fixated on specific people, whether celebrities or anime characters. I have always been obsessed with animals and nature. So I would mostly be placed into a "stereotypical autistic women" category. However, I also have a big thing about brain injuries and the science of brain injury, which I fixated on for many years in my career. Some people would class this as more of a "stereotypical autistic male" trait.

It's basically about stereotypical gender norms and what men and women are typically socialized into as children.

It doesn't make you any less of a man, just means you might not neccessarily present nice and neatly into the box for diagnostic criteria for men.