Their likes are not removed when you block them. That would be an IDEAL feature for Facebook to incorporate. When you block someone, there should be a pop-up th… at asks: Would you like to delete all likes and comments from this person on your posts and photos? It makes sense to be able to do that without deleting your entire post or the photos.
https://www.facebook.com/help/community/question/?id=10208840650670726

