If this person became a victim of scammers and found this photo on rwi, he should be grateful that he was prompted that this watch is not original, before he tried to sell it to someone. Then, he can contact the moderators and ask to edit the post. Also, even if he did it deliberately, he, as you rightly said, has the right to defend himself, and also solve this issue, in the way that the administration will prompt to settle it if he is not already doing this at the moment.
To the best of the specifics of my upbringing, I will not compare the correspondence on the forum on the Internet with "nazism", I just want to note that any issue can be solved simply if everything is done directly and clearly.