Never argue with a Winnicottian s/he will play with you and call it reality.
S/he may also argue about true and false self implying s/he is displaying his/her true self and you are displaying your false self.
S/he may also talk about good enough parenting and play to your mother/fatherhood or your being as a son or as a daughter.
Winnicott was a student of Riviere who helped to censor Ferenczi. Called him a mad man and tried to "save" his reputation.
She was also on the side of Klein group. My intuition tells me Winnicott was writing letters to Klein but they were coming from Riviere. Frenemies.
If you are wondering why I am obsessed with Klein and Ferenzi and using splitting as a rhetoric:
Freud wrote 5k pages of texts. Similar in other psychoanalists. I will not dedicate my life to reading texts who were written by those who were not doing science but trying to be famous.