1) Open the Messenger App on your Android smartphone.
2) Tap on any friend name to open the chat conversation.
3) Tap the little round icon with (i).
|tap on Block|
There is two option available there “Block all messages” and “Block on Facebook”.
6) Now if you wanna block your friend on Messenger only then tap on “block all messages”.
7) But if you wanna block your friend on Facebook too then tap on the “Block on Facebook”. That’s it.
|Block all messages|
If you’ve followed the steps outlined above, you will successfully get rid of any friend bothering you on Facebook messenger.
- Source: learnfacebookbasics.com