Actually, I didn't once use that phrase "nothing matters" in my text, it was titled in the YT video. I used the subject nihilism as the most exaggerated form of "nothing" to point out that it stands in stark contrast to "everything", i.e. giving too much meaning to something, identifying with something.
Then I gave an example of people who build up an ideology and over-identify with it. And use a trick by saying that human rights are not up for debate.
I need not to determine the minds of others, they make them up on their own.
With my last sentence I was describing the difference between light mindedness and heavy mindedness, something I experience as altering. On this spectrum you can hit rock bottom or you can also feel serenity. You initially gave me an example of rock bottom to which I related.
Clearly your post is about a state where nothing matters, but you're correct that you never used the term "nothing matters". So I withdraw my original comment, as I believed you were talking about something I have experience with. Also because I find you are fighting to win, not arguing to find truth. To me those are not the same thing and the difference matters. Carry on.
I did not relate "nihilism" to depression. It was not my clear intention to do so. If it were so, I would have visibly talked in my post about "depression" linked to nihilism.
Though I - after you talked about it - confirmed it to be true that in such a depressed state of mind the thought that "nothing matters" is very dominant, depression in relation to nihilism was not part of my given context.
I followed what you believed I was talking about and added some of my thoughts on the subject as I went along.