Your analogy is strange. You realize I have never worked as a recruiter, right? This is the second time you've referred to me as a recruiter. I do things in the intersection of interviewing and technology space, yes, but I've never worked as a recruiter. I know you know that I'm not a recruiter, so... whatcha up to over there? Whatcha trying to prove?
This talk discussed coding at far more depth than the vast majority of recruiters could do. How many recruiters could tell you about big O time? Binary trees? Breadth first search? Not many.
Also, are you actually trying to argue that gender isn't a factor in how people perceive someone?
Tell me how you would like to brush off these examples:
1. Someone asking me at a conference exclusively for programmers where you MUST be a programmer to attend [there are no company booths or anything like that] if I've ever considered learning to code.
2. Someone asking me in my first week at Google if I'm new to marketing. This was in an office that was exclusively engineering. There was no marketing team there. I was just walking down the hall and said someone came up to say this.
3. At a small event where at least 50% of the people worked for Microsoft or Amazon, someone starting off the conversation with "So I assume you don't work for Microsoft or Amazon."
4. At an event which was very, very programmer heavy, someone walking up and saying "hey it must be great for you to meet all these programmers. At least you've got someone to fix your computer."
5. Someone referring to me at CES, where I was staffing the Google booth, as a "booth babe." (Keep in mind that CES doesn't really have booth babes, nor was I dressed at all like a booth babe.
6. Someone actually specifically admitting that he was surprised that I was teaching technical interview topics. He specifically said that he assumed otherwise because I was female.
7. On a technical interview video on YouTube, 2/3rds of the comments are either overtly sexual or overtly sexist (e.g., "I would've hit on the interviewer. I wouldn't be able to focus on the problems!", "Good tits").
This stuff happens all the time. Note that #1 through #5 had nothing to do with my working in the interview space. #6 and #7 is pretty clearly gender related.