No honestly if we change it to be a woman dominated field where I'd feel unwelcome instead of a male dominated field, like say teaching, I still wouldn't be upset at the assumption because frankly it doesn't hinder my ability to understand the material, I can read it as a typo and move on.
Unless I guess the person was aware of who I am and intentionally misgendering me to be a dick, then yeah, but if we've never met and the thing I'm reading is general, then it basically is just a typo the author didn't realize they made.