I write more about them here:

https://eichy815.medium.com/heres-how-you-can-identify-an-ism-a7542d924a2c

Systemic Racism = Prejudice + Power (or Privilege)

Social Racism = Prejudice + Bullying (or Bigoted Harassment)

Cultural Racism = Prejudice + Groupthink (or Mob Mentality)