You can easily disable password hints in macOS by opening the System Preferences, clicking on the “Users & Groups” System Preference pane and then clicking on Login Options. From there, uncheck the box for “Show password hints”
You can also disable this feature using the com.apple.loginwindow defaults domain. Send the following through a script to do so:
defaults write com.apple.loginwindow RetriesUntilHint -int 0
