It always seemed to me that Suellen and Frank genuinely liked each other and got along. :-) She probably was her best self when with him and getting attention instead of being the middle child and overshadowed by her domineering sister. Scarlett's point of view of Suellen was probably the single worst. :-) I can understand why Rhett liked Scarlett at 16. She wasn't a hypocrite and she expressed anger, and he was heartily sick of hypocrisy.