The image is a reddit post with the following text (automatically transcribed):
I remember I got into an argument on reddit awhile ago with a person over Italian food. It got to the point they were following me into other subs to harass me. I clicked on their profile to block them and their most recent post was them drinking their own piss on r/piss. At that moment I realized I had spent so much pointless time arguing about the taste of food with someone who drinks their own piss as a hobby. This site is a shit hole.
I assume the thinking is because it's toxic, nothing lives in it. It's an incorrect assumption, there are bacteria in it, but that's probably where the misconception comes from.
For years, even doctors believed urine was sterile. The myth goes back 50 years, Hilt said, when a screening method for kidney infections was developed. It was a simple and easy test that was soon applied to bladder infections, too.
But the test involved culturing only a small amount of urine in open air, at a temperature of 95 degrees Fahrenheit (35 degrees Celsius) for 24 hours. Not all bacteria grow in those conditions.
Stop trying to explain jokes Gary, just enjoy the fucking things and smile. If someone is done enough to believe anything from a random comment fuckem lettem nature themselves away.