Why do these racists think they can just insult Chinese people and walk away?

Just a few days ago, I encountered two racists in Melbourne. They just randomly yelled “F*** you Chinese” at me on the street. I was so mad that I chased them down, but of course, they just ran away like cowards.

I don’t get it. Why do these people feel entitled to insult Asians? Is it jealousy? Is it just ignorance? Like, dude, I’m just minding my own business, and you come out here spewing hate?

What do you guys do when you encounter situations like this? Do you fight back or ignore them?