Whatever problems you may have with my ethnicity hardly seem relevant here! We're talking about con men falsely claiming that their software is open-source in order to free-ride on the goodwill the open-source community has earned through decades of hard work and persistence against impossible odds in order to guarantee basic human rights to everyone in an increasingly computer-mediated world. If it takes douchebags to show the falsity of their false claims, then let's have more douchebags! (But actually I think people of any ethnicity are equally capable of standing up for what is right; it doesn't have to be a douchebag like me.)

I don't know why you think the error was unintentional in this case. The poster in question wrote, "You mean open source yes, free software no." They are implying that they not only have knowledge of the nuances of the definitions in question, but are so certain of it that they correct other people for misusing the terms — they aren't just guessing. Presumably such a person will at least have read the introductory paragraph on the Wikipedia page for "Open-source software"!