Deleting and Blocking Friends
Block a User
To Block a user who added you, tap 'Added Me' on the Profile Screen.
Tap their name, then tap next to their name.
Press 'Block' to prevent them from sending you Snaps, Chats, or from viewing your Stories.
Press 'Delete' to remove them from your friends list.
Unblock a User
To unblock a user, tap on the upper-right corner of the Profile screen. Tap 'Blocked' under the 'Account Actions' section at the bottom of the Settings screen.
You will see a list of the users you have blocked. Tap 'X' next to their name to unblock them.