Comedian Lil Duval went onto Friday's "The Breakfast Club" radio show and disparaged transwomen.
He said he would kill a transwoman if he learned she was born a male.
Since transwomen are often the victim of violence, this has not been well-received.
Clearly, he needs some education.
"This might sound messed up," he begins to say.
Cox reached out via Twitter, sharing a tearful reminder about the lives of many transgender individuals.
To learn more about the issues transgender people face, head to the HRC website. Unsurprisingly, there's a whole section on transgender individuals and the violence they endure.
If you follow Lil Duval or The Breakfast Club, be sure to let them know how you feel!