I am not affiliated with AO3 in any way. I cannot guarantee this solution is a permanent or sustainable fix. I do not know if making a ridiculously long blocklist will negatively impact your browsing experience.
I've also heard there's an issue when naming skins. Each skin must have a unique name, so sadly "Taking out the trash" does not work. Please come up with a unique and original name.
Anyone is free to translate and reuse the guide.