I take issue with the specific wording in your comment, "...but why wouldn't you just say..." It makes it sound like discrimination is not a big deal, because if you were just "taught to be assertive," you could handle it.

There is nothing she could have done to prevent the discrimination other than being a man. The entire article is set up to emphasize the way that anyone should be able to tell she's a gamer from the way she holds her hands on the keyboard, and yet they still treated her like someone who does not belong in the industry.

The point of the article is to increase awareness of discrimination among the "large anonymous audience." It is offensive to suggest that victims of discrimination should just act differently to prevent it.