Why is OK for online daters to block whole ethnic groups?

The Guardian 

Sinakhone Keodara reached his breaking point last July. Loading up Grindr, the gay dating app that presents users with potential mates in close geographical proximity to them, the founder of a Los Angeles-based Asian television streaming service came across the profile of an elderly white man. He struck up a conversation, and received a three-word response: "Asian, ew gross." He is now considering suing Grindr for racial discrimination. For black and ethnic minority singletons, dipping a toe into the water of dating apps can involve subjecting yourself to racist abuse and crass intolerance.