From The Independent:
In the moments before the cell phone picked up the incident, Richards was evidently told by two black hecklers that he wasn’t funny. He turned on them almost immediately, telling them he was rich and could have them arrested and escorted out of the place if he felt like it. That didn’t go down too well, and the hecklers let him know they didn’t appreciate him lording it over them.
“Didn’t appreciate him lording it over them…” makes one thing it was a gentemanly exchange prior to the racial epithets and lynching threats.