This picture has been going super viral on Brazilian Facebook since Monday after a man named Nelson Filippe posted it.
In his caption, Filippe wrote, "I'm not prejudiced. I think people should do whatever they want to with their lives. But I think it's absurd that I should be forced to witness a scene like this."
"What people do in private is their business only, but yes, what they do in public concerns me," he continued. "And I refuse to see a scene like this and consider it normal."
"They're challenging social conventions, and that can be dangerous. What if some tragedy strikes, or worse, if someone dies, who's to blame," he wrote.
"What would happen to a child who sees this scene every day? Kids will think it's normal to wait for the subway on the yellow line. So, don't act like that guy over there. Follow the example of the girls," he finished.
Filippe's joke about the dangers of not standing behind the yellow line in the subway has been shared thousands of times.
Here he is celebrating his accidental viral message of train safety and tolerance.