I would say it is less a social faux pas and more so a case of not applying scientific method/using the internet wrong.

You have an article of some sort, you also have a video that shows the ocurrance from three different viewpoints (I.e. recordings of ppl.).

However, you didn't verify the article, blindly trusted it, and used it right away to criticise somebody else's statements.

You don't have to watch the video if you don't want, but then you shouldn't either make statements you cannot be entirely sure of.

This also does not only apply to this case, but generally. Everyone can write a book, Wikipedia article, article, etc. Best case is either checking the base source or multiple sources to see if they agree or something that has been reviewed by multiple ppl./experts. Otherwise, never trust it fully. Also don't trust any LLM unless you do the same. Latter is a side note.

Edit: also, I am not saying you are entirely wrong with your statements, as I cannot verify them myself; I don't speak Portuguese. Alas, most of the people think you are (also by itself not entirely reliable) and it does indeed from the video seem like both the article and you are wrong.