I'm at a loss as to why this is "ridiculous". If anyone, male or female, is entering a profession which is dominated by a certain demographic, and is not welcomed, they are less likely to continue to pursue that as a result. This pressure is sometimes deliberate, but often subconcious and not especially mean-spirited. If you don't make the effort to "fit in", whatever that entails, then the status-quo is not going to change to include you.

You must admit, the attraction of working at a company, or in an industry, where you are constantly agitated by your peers, would have less of an attraction than an alternative which would accept you more readily.

Consider how difficult it was for women to enter any traditionally male-dominated profession, such as medicine, law, or politics. Times are changing, but 100 years ago, there would have been very serious backlash. It was deliberate, to preserve the status-quo.

Whatever the circumstances today, I'm not especially concerned about the gender balance in technology today. If people do their part, such as keeping the environment more professional and less like a "boys locker room", then we all benefit. The pseudo-impersonal nature of the Internet may actually be a factor, since gender is less "visible" as well as being less of an issue.