Today, I finally snapped.
At an old white man who was walking past me down Ludlow. He gave me a disgusting smirk and decided to say, Hello, and also add a translation for me in case I didn't understand: Ni hao! And I just couldn't. Although a second too late, I found myself spitefully shouting FUCK you, and wow, why didn't I do that before? It was cathartic.
Perhaps I just felt less threatened by an old man, which makes the deed feel less empowering.