How to remove notification for suggested friend on Facebook?
Example: do you know John? You can add him as your friend. It's giving me notification on the person that I do not know.
One trick I use is simply to block that user.
Click on the suggested person, that gives you their home page.
Click on the three-dot icon below their picture, a dropdown menu appears.
In this dropdown is the option Block User. Block them, Facebook stops offering that person as a friend.
It is however bit of a pain to block dozens of users. Don't forget that Facebook will just offer you someone else instead and you may not know them either.