These are unconscious social biases. Men are not evil for not hiring women when they don't understand the style of communication being used. When women are hesitant explaining the gaps in their resumes from childcare, or don't have any confidence answering questions, it's hard to blame men for going with someone they see as confident.
The reason I posted this was to show that the people who want and need to come to our seminars are people who already know how to code, but don't know how to get jobs in tech.
I'm happy to answer your questions here in the comments. I am one of the LadyCoders; my name is Tarah Wheeler Van Vlack. LadyCoders is an initiative that puts on seminars and provides mentorship for programmers (often women) who find that they're having problems getting jobs in tech. Women often suffer from Impostor Syndrome. That frequently manifests itself as the inability to be confident about their skills in front of technical interviewers.