Mrs. Johnson insults Mrs. Younger's family. Who does she insult and for what reasons?

Mrs. Johnson insults Walter.... saying he's lazy and uppity all at the same time.

JOHNSON Mmmmmm, he sure gets his beauty rest, don’t he? Good-looking man. Sure is a good-looking man! (Reaching out to pat RUTH’S stomach again) I guess that’s how come we keep on having babies around here. (She winks at MAMA) One thing ’bout Brother, he always know how to have a good time. And soooooo ambitious! I bet it was his idea y’all moving out to Clybourne Park. Lord—I bet this time next month y’all’s names will have been in the papers plenty—(Holding up her hands to mark off each word of the headline she can see in front of her) “NEGROES INVADE CLYBOURNE PARK— BOMBED!”