Hello, new user here. Seems like tag blacklist doesn't actually have any effect when I'm browsing the posts. For example, I included futanari in my tag blacklist but it still shows posts with that tag. I pressed save whenever I made the change to the blacklist and have javascript and cookies enabled as well. Each tags were also separated by space as well. If anyone can give me some pointers to how I can solve this problem it would be greatly appreciated.

wierd, have you tried adding the tags first? to see if it blocks?

Damn, I feel stupid.
There was a problem with a user abusing the voting system to manipulate the score of all of another user's cards and hide them on the front page. The only workaround that I am capable of implementing is changing the website's default css so hidden posts are still shown. I have already implemented this change, but it didn't occur to me that posts hidden through methods other than score (such as the tag blacklist in your case) would also stop being hidden.

The problem is on me to fix, but if you don't want to wait you could overwrite the default css for the website with your own using a plugin (like stylish) or something. Just remove the last 5 lines of the css that is currently being served and posts will be hidden again.