One of the reasons that dealing with Narcissists is tricky is that they do not play honestly. They will easily employ deception to accomplish their purposes.
A Narcissist will hate anyone who gets in the way of their “glory” through making them look bad or otherwise opposing them. You will become their enemy. While its possible that they will respond with a full frontal assault, its also possible that they will keep their feelings hidden until a time that they can do the most damage. They will try to disguise their hatred with their lips, by speaking graciously to you even while they hate you in their heart. But don’t believe them. They still fully intend to “trash” you (Proverbs 9:7 – “he who corrects a scoffer gets dishonor for himself”), they’re just waiting for a better time.