This organization appears to be advocating anti hate but they actually hate conservatives, heritage Americans, and Christians. They also attack businesses that go against their far left agenda. 

Examples of what they call "hate":

- Focus on the family (Christian organization)

-PragerU (conservative organization)

-Dixie Republic (Business that sells items the splc disagrees with)

- United Daughters of the confederacy (organization that has gained a bad reputation over the years)

- anything anti immigrant

I could list more.

https://www.splcenter.org/resources/extremist-files/?meta_extremist_type=group