These are difficult times, indeed, and we need to be very careful. It is always good to be benevolent and kind, it may touch others to become benevolent and kind.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .