Let's also look at methodology:
The graph is compiled from compiled browser statistics with an n of millions, those statistics derived from browser cookies and tracked data.
Your boyfriend's graph is a self-reported survey with an n of 100 where "meat popsicle" is an acceptable gender.
You might be interested to know that rigorous data is available; however, because Hubski isn't in the top million websites on the internet the data is pretty noisy even when collected properly (for example, according to Alexa, the #3 search term linking to Hubski is "wombat poop").
Nonetheless, a comparison can be drawn if we compare informationisbeautiful, google ad info and alexa data for one site, let's go with Pinterest:
Google Display Network:------------ 68/32
(Males under-represented, confidence high; females over-represented, confidence high)
Seems about right - according to Alexa, there's half as many men as there are women on Pinterest, or around a 66/33 split. Shall we see what Alexa has to say about Hubski, "wombat poop" aside?
(males greatly over-represented, confidence low; females greatly under-represented, confidence low - there's that wombat poop for ya)
In other words, worse than Reddit (Confidence high)
But better than 4chan (confidence high):
So data can be had, and it can be had in twenty minutes of searching. It's not perfect data, and it's not uncontroversial data, but it's substantially better data than a self-reported pie chart with an n of 100 that says far more clearly that women don't like to take surveys and kids under 15 do. Really, the survey says what self-reported surveys always say: some people take more surveys than others.
I didn't participate in the survey because, as the founder of /r/favors, I oversee 5-10 self-reported surveys a week about anything and everything and know full well that outside of statistics 101 they aren't applicable to anything. it is fundamentally, patently obvious to anyone and everyone that your survey reflects what we knew over a year ago: everyone is from Reddit.
Good, bad, indifferent, who knows? If we're going to demand that the entire site demographics change because our girlfriend got her feelings hurt, on the other hand, let's inject a little bit of rigor into the data, shall we?