I have had to cut out an abusive member of my family. That was over 10 years ago and all I can think is ‘why didn’t I do this sooner’.
A word of caution though. After making it clear I he was cut, out, it has come with a lot of consequences such as not being invited to family functions since they wanted him there, questions from nosy people and a lot of ‘How could you do that to family.’ So if you are not willing to put up with the back lash, don’t do it.
Also, there could come the day that you want them back in your life and they will hold cutting them out against you and you need to be ready for that.
So to recap, yes it is OK to cut someone out, but the consequences are big