Laverne Cox and her friend were targeted in a transphobic attack.
The 'Orange is the New Black' actress is still "in shock" following the incident, which occurred when she was walking with a pal in Los Angeles' Griffith Park and a guy asked them for the time followed by "guy or girl?".
Speaking in a video on her Instagram account, she said: "The friend that I'm with looks at his watch and tells him the time, and then the guy who asked for the time says to my friend, 'Guy or girl?' My friend says, 'F*** off.'
"The guy is like hitting my friend, and then my friend is going toward him and I'm like 'Holy s***.
"I pull out my phone and I call to dial 911, and all of a sudden it's over and the guy is gone."
Laverne believes the offensive question was aimed at her rather than her pal.
She said: "The guy really wanted me to answer so that he could spook whether I'm trans or not.
"I don't know why, I don't know why it matters. At the end of the day, it's like who cares?
"I'm in a hoodie and yoga pants, I'm completely covered up, I've got my mask on. Who cares if I'm trans? How does this affect your life?
"This isn't shocking to me. Obviously, this is my life. I've dealt with this a lot, but it never fails to be shocking."