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.