Sometimes it's not landing the job, it's being able to withstand the environment. I field tech calls all day and i STILL get the "Can I talk to a tech?" meaning "Can I talk to someone who isn't female, since you're obviously a receptionist?" I have people go as far as trying to "test" me on my knowledge, and actually apologize when they realize that no, i'm not reading from a script.
Now of course this isn't true of every company that has to do with technology - but to me it seems that a hiring manager placed with the challenge of hiring two possible applicants, one male one female, with identical credentials may choose to place the male in a more techy job and the female in more of a paperwork position - because he thinks that she might bruise her little hands and heart working with tough guys all day.
I do, however, feel this has changed significantly in even the last 10 years. Most of the people who scoff and ask to speak to a technician (someone male) are likely older and used to a different generation.