If Rashad was indeed the one who said they didn't enjoy acting with Metcalf because she was playing it "real" and Laurie wasn't, I find that to be quite funny. To me, what was so brilliant about Rashad's performance was how "non-real" seeming it is. It definitely didn't seem to be naturalistic or anything like that to me. It was so affected which is what made it hysterical but also bruising. She was playing at stereotypes of modern women and teenagers, and of a child of divorce (I'll never get how perfectly she delivered the line "I feel special."
So when she did drop that act, and went for a real, naturalistic line reading, it really stuck out. Laurie had a very similar quality in her performance.
Ah well, if that is the case, sorry to hear she didn't enjoy that experience. It was great watching them together on stage. On a related note, I can't think of many actors who come across as "real" as Laurie does, even when she's playing slapstick comedy.