We can identify abusive fiction books by checking for harmful stereotypes. For example, if a book consistently portrays a certain race, gender, or group in a negative and unfair light, it may be abusive. Additionally, the way relationships are depicted matters. If there are a lot of toxic and abusive relationships shown as normal or even desirable, that's a red flag. And if the book seems to be causing discomfort due to its overly cruel or unethical content, it might be an abusive fiction book.
To identify abusive fiction books, look at the power dynamics in the story. If there is a constant imbalance where one character or group is oppressing another in a very cruel and unjust manner without any form of redemption or counter - narrative, it could be an abusive book. Also, the emotional tone of the book can be an indicator. If it leaves you feeling angry, violated, or uncomfortable because of the way it treats its characters or themes, it may well be an abusive fiction book.
One way is to look for excessive use of offensive language. If a book is constantly using derogatory terms or slurs, it might be considered an abusive fiction book. Another aspect to consider is the portrayal of characters. If they are constantly being subjected to unjust and cruel treatment without any real purpose in the plot, it could be a sign. Also, themes that promote violence or discrimination in a very extreme and unchallenged way can point towards it being an abusive fiction book.