How to stop someone from liking your facebook page?

[Sad for Muslims]

How to stop someone from liking or commenting on your facebook page?
not to stop all people, just those who write unwanted comments on your facebook "page"

thanks
@ Christian Chin
blocking them doesn't do anything
we are talking about my "page" not my profile.
If I block them, it will be worse, they will comment on my page, and I won't be able to see their comments.

[Christian Chin]

YOU CAN BLOCK THE PERSON.