While I agree with you that DDs shouldn't have +enmity on their gear, I am curious, did you have /nin and were shadows up? Did the pld cover you? While tanking a pld should use either /drk or /blu for better enmity options. If you brought a sch they can help reduce hate with animus but it's hardly ever used. The -enmity that you have is only 5/5 and if you had +enmity gear on, your merit was probably negated.