The correct answer to someone whining at you about the use of any AI utility is "If you feel I need to be stopped, please dial 9-1-1 and file a police report."

Don't justify yourself, don't grovel. Make it clear that if they want to try and stop you, they're free to try and stop you. If they feel a crime has been committed, the police are standing by 24-7 to take their report.

Otherwise, they can shut the fuck up and kill themselves.