please don't sexualize programming

The character in the cartoon that did so, is roundly and emphatically put in his place for thinking with his dick. That's the joke.

In cartoon form, so no individual can be offended by it, your exact point is being made. And being made in a way that will have far more impact on the general male programmer than any amount of -- please forgive the phrase, it isn't aimed at you -- preaching.

telling me that I just didn't understand the joke right

It wasn't you that missed the joke -- you might have, but that's neither here nor there -- it was pemungkah. Perhaps a linguistic thing?

There is nothing wrong with raising issues like this, but you do have to do so by picking on real examples. This was not such an example.

posts a link to a very nice keynote,

I agree completely. So much so that I watched it all the way through and then actually cited and re-linked it in another thread within hours.