Why does Aunt Alexandra accept that the Cunninghams may be good but are not “our kind of folks”?
Aunt Alexandra is cool with there being a caste system in Maycomb as long as she is at the top of the system.
I think what she is trying to say here is that she accepts them and is happy to have them be a part of society, but when it comes to marrying into her family, that's not okay. Socializing with her family is really not that okay. She believes people should have relationships with those of their own kind (within the caste system which would be in this case 1. those like the Finches, 2. those like the Cunninghams, 3. those like the Ewells, and 4. the Negroes).