The developer is an Atlassian employee. He gave the talk at an Atlassian organized conference. I would assume his talk must have been approved internally in some way or form (unless any employee was able to give any talk they wanted without any form of supervision, in which case there's a deeper problem here).
So here's my question: why wasn't this terrible "joke" cut out from the slides months ago? Why, when the guy was preparing his talk, presumably rehearsing it in front of his coworkers, sending the PDF of the slide to organizers of the event, etc., did no one speak up and say "Dude, that slide is sexist and doesn't add anything of value to your talk - just remove it"?
The fact that this didn't happen leads me to believe that the internal culture at Atlassian must be quite terrible, and very much the opposite of an environment where acceptance and diversity flourish.
(EDIT: received 3 downvotes on this comment less than one minute after it was posted. Looks like the Atlassian PR department is keeping watch. Hi guys! :) )