Three protesters were racially abused at a ‘Unite Against Fascism’ march.
Tony Hyam, 48, screamed ‘You bunch of n**** lovers’ at the protesters in Villiers Street, central London.
Hyam also screamed ‘Refugees are not welcome’ at the three women, Westminster Magistrates Court heard.
Speakers at the event included Diane Abbott MP, poet Michael Rosen and comedian Jeremy Hardy.
Kate Shilton, prosecuting, said: ‘On March 19 a group of people were attending a Unite Against Fascism rally.
‘As the three victims, Jasmine Jackin, Zlatka Jakin, and Nadia Jackin turned onto Villiers Road, the defendant began shouting abuse and racial slurs towards the group.
‘He called them a “bunch of n**** lovers”, “dirty n*****” and shouted “refugees are not welcome here”.
Ms Shilton told the court the victims had been profoundly affected by the harassment.
Reading a statement from Zlatka Jackin, the mother of the two other victims, she said: ‘I now realise some people still regard others as a lower class or lower race.
‘It made me very upset.’
Hyam admitted using threatening or abusive words, one count of racially aggravated harassment.
Judge Joanna Matson adjourned the case for reports before sentence on September 15 at Westminster Magistrates Court.
Hyam, of Shearwood Crescent, Bexley, pleaded guilty to one count of threatening behaviour and one of racially aggravated harassment.