The assumption that developers are men is enough here, and speakers at the conference mentioned in the song have expressed surprise and distaste at their inclusion. For example, they say "Lea Verou will make your dreams come true" to which Lea noted: "I think mine tops all of them in terms of cheesiness and creepiness."
As much as it's tacky fun (much like that hack day note about having women serving beer [1] or the woman in her underwear promoting geek t-shirts [2]), it's also antagonistic, creepy, objectifies women, and reinforces an image that no-one wants or needs at a programming conference if we want to appeal to a diverse audience. Sadly, people who brush this off as OK are part of the problem but will deny this until, well, they sober up later on (said as someone who felt the issue was unimportant a couple of years ago).