Cancel culture is modern day slacktivism. As Oliver Sykes said in the song Antivist, "if you really believe in the words that you preach, get off your screens and onto the streets". The whole concept is idiotic and lazy.
"Cancelling" someone is also essentially the modern day version of cyberbullying someone, especially when someone gets "cancelled" over some shit that they may have said or done several years or even decades ago.