A dirty joke. So far, he's copped to sexual harassment.
“So far, he’s copped to sexual harassment.”
Nope. Telling a joke, even a dirty one, is not sexual harassment.
“Sexual harassment is a form of sex discrimination that violates Title VII of the Civil Rights Act of 1964. Title VII applies to employers with 15 or more employees, including state and local governments. It also applies to employment agencies and to labor organizations, as well as to the federal government.
Unwelcome sexual advances, requests for sexual favors, and other verbal or physical conduct of a sexual nature constitute sexual harassment when this conduct explicitly or implicitly affects an individual’s employment, unreasonably interferes with an individual’s work performance, or creates an intimidating, hostile, or offensive work environment.”
https://www.eeoc.gov/eeoc/publications/fs-sex.cfm
“Although laws surrounding sexual harassment exist, they generally do not prohibit simple teasing, offhand comments, or minor isolated incidents — that is, they do not impose a “general civility code”.[3] In the workplace, harassment may be considered illegal when it is so frequent or severe that it creates a hostile or offensive work environment or when it results in an adverse employment decision (such as the victim being fired or demoted, or the victim quitting the job).”
https://en.wikipedia.org/wiki/Sexual_harassment
If telling a joke that someone takes offense to was illegal, all joking would have to stop.