Merriam Webster defines cancel culture as a social environment in which publicly boycotting or withdrawing support for people, organizations, etc. regarded as promoting socially unacceptable beliefs is widespread practice.
Dictionary.com, in its pop-culture dictionary, defines cancel culture as "withdrawing support for (i.e. 'canceling' ) public figures and companies after they have done or said something considered objectionable or offensive."
Cambridge Dictionary defines cancel culture as a way of behaving in a society or group, especially on social media, in which it is common to completely reject and stop supporting someone because they have said or done something that offends you:
The Top 10 Banned or Challenged Books of 2020
George by Alex Gino
Stamped: Racism, Antiracism, and You by and Jason Reynolds and Ibram X. Kendi
All American Boys by Jason Reynolds and Brendan Kiely
Speak by Laurie Halse Anderson
The Absolutely True Diary of a Part-Time Indian by Sherman Alexie
Something Happened in Our Town: A Child’s Story About Racial Injustice by Marianne Celano, Marietta Collins, and Ann Hazzard
To Kill a Mockingbird by Harper Lee
Of Mice and Men by John Steinbeck
The Bluest Eye by Toni Morrison
The Hate U Give by Angie Thomas
How to avoid cancel culture?