In The Merchant of Venice, as Shylock and Antonio discuss the "bond" that Antonio will owe on Bassanio's behalf, Antonio wants Shylock to understand the extent of his dislike for him and says:
I will probably call you this again, spit on you and even mock you. If you are going to lend me this money, do not lend it as if I am your friend, because how can I be friends with someone like you? It would be unnatural. Rather understand that I am your enemy and if I do not keep to the bond, you can penalize me without feeling any guilt at all.
Antonio has no intention of hiding his hatred for Shylock and, in being blunt also reveals his deep prejudice, insulting Shylock and Jews by making reference to them being "barren metal."