I would hope they are bigger than that. Any discussion you have with that school should be about your son and the school, not other players. Anyone buy the kid an alarm clock? I know everyone uses their phones now for that.
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 .