Press the PS button on your controller to open up the control center and select Game Base.
From the Friends tab, select a player from the list or search for a player. You can also select players from the Parties tab by selecting the party and then the player from the members list.
On the player's profile select ... (More) > Block.
Press the OPTIONS button on your controller and select Blocked Players.
Select the player and choose Unblock.
If you want to add this player to your Friends list, send a new friend request.
What happens if I block a player?
Blocked players and you (the blocker) can't do the following:
View each other's profile, activity, or personal information.
Add each other to parties or watch each other’s screen during Share Screen.
If a blocked player is added to your group by another player, you won't see each other's messages.
If you're in the same party chat, you won't hear each other's voice or watch each other's screen during Share Screen.
How to limit the players who can interact with you
You can use privacy settings to limit who is able to send you friend requests or messages. For example, if you don’t want to receive messages from people you don’t know, you can set your privacy settings to Friends Only.