"Friend" on facebook called me a tool on my profile picture. Should I delete him and the comment?

[Gfhg]

I rarely change profile pictures (about twice a year) so I am not one of those people that posts meaningless pics every second or minute. But this dude has been acting weird as of late and now he has called me a tool on my facebook profile picture. He has told other "friends" on his facebook to either "kill themselves" and "your life is pointless, end it now" when they posted statuses about their issues and has called other people distasteful names too. I don't know what happened with this guy, he used to be a nice and cool dude to hang out with but idk now. My profile picture was aimed more towards family and I have a lot of family who like and commented on the picture so I don't want them to see this. Should I delete the comment, delete the friend or delete both?