As a stream of racial slurs directed at the New York Rangers prospect K’Andre Miller popped up on fans’ screens during his online video chat with them this month, Alyx Farias was shocked yet not surprised.

Farias, 24, participated in the live Q. and A. session and captured a video of the slurs — which Miller, who is African-American, appeared to have seen. Then Farias posted her screen grab to Twitter, where it quickly went viral. To date, Farias’s video has been viewed over 300,000 times.

“You could see in the video that I posted, he sees it when he looks down,” she said of Miller, a defenseman who was picked in the first round of the 2018 draft.

The language on the chat was the first public act of racism connected to the N.H.L. since its December announcement of a “zero tolerance” policy for abusive behavior and of required diversity and inclusion training for all coaches and general managers.