I don't. I mean, if it's a news site just search for the title in a search engine and you'll find other articles. If it's a web application I search for an alternative and bookmark that. If you really want to avoid even loading it, you can just block the whole site with your adblocker but I don't go that far.

That is what I currently do. It turns casual browsing into a frustrating scavenger hunt. The whole point of the web was to make links effortless so you could browse sites. This breaks that whole model.

Very few sites are broken with ad blocking. If you click on one, you just press the back button. No need for a mental blacklist.