Setting aside the apparent social hierarchy among racist fish sex researchers, this thoughtless comment managed to sneak its way past the authors and their dozens of drafts, the other scientists who reviewed the paper, and the editors of the journal. The authors and journal quickly acted to remove it and apologize, but not before it was picked up by dozens of news websites. And hey, that's not the first time this happened!
2011 saw another science paper slip-up. A group of biologists published a paper with the supremely helpful citation "insert statistical method here" -- revealing that the actual sciencing in their science paper was only an afterthought. At least they worded that better than this genius:
"Oh, and delete this while you're at it. It would be horribly embarrassing if you didn't."
The lesson is clear: Always remember to pay your proofreaders, for they have the power to expose you as a lazy slob in front of the whole world.