Vitor explained it exactly as I described it above:
If 5+ people of each user's following list report you, the post is hidden for them. So, each person has a different view of nostr.
"I dont want to see what others muted"... Not quite. Mutes are reports are different things. People can mute a lot of folks and that won't have any effect on your experience.
Reports are the more violent version of mutes, that affects lots of different parts of nostr. For instance, many relays use reports to delete content they do not want in their server. Reports are made for other people. Mutes/Blocks just for yourself.
Remember, it must be 5+ users from the list that each person is following.
So, something for me can appear but for you don't. It depends on what our follows reported.
So, if you get 1000s of reports from idiots that nobody follows or just their gangs follow, you still show up for everybody, expect for them and their gangs.
He explained it rather patiently, given how hard you were going after him about it, actually. Even so, after that explanation and the conversation ended amicably, you STILL didn't get it, because you STILL think it's based on mutes. It's not. It's only based on reports, and by default it has to be 5 or more reports (not 4) from npubs you follow, before a post gets covered by a warning, which you can just tap to show anyway...