You can now block users on The StoryGraph.

Blocking hides you and the other person from each other across search, reviews, news feeds, and suggested users. It also removes any follows, friendship, and likes between you, and stops either of you joining a buddy read, book club, or readalong hosted by the other.

To block someone, tap the three dots next to their username on their profile.

You'll find everyone you've blocked under Manage Account > Blocked Users, and you can unblock them from there.