The good news is, you can block that person on Facebook messenger without blocking him as a friend. Superb, right?
This step-by-step guide will show you exactly how to do it, so stick along for the ride!
HOW TO BLOCK SOMEONE ON FACEBOOK MESSENGER
Remember: Blocking someone on Facebook messenger app doesn’t mean you have blocked the person on Facebook entirely, the person is still your friend. To block someone entirely on Facebook, click on this link: How to Block a Facebook Friend.