You can block/ report users you would not like to display on the timeline or receive chats or replies from.
By addressing the issue from the post, you can deal with the issue without leaving any footprint on the user.
■Steps (For iOS/Android)
1. Display the post on the timeline or profile screen
2. Tap the [︙] icon at the bottom right of the post
3. Tap Block/ report or the action you wish to take