This movie struck a lot of personal chords for me, and perhaps those that did not enjoy it have not had these experiences. Being a passionate young woman that is trying so hard to differentiate is not an easy part of life. You are doing the best you can but you don't know all the ways you are messing up. Motherhood is a lot the same. You don't get a playbook and you have to figure it out with so many strong emotions always rolling around. There is disappointment and bitterness at times of wishing life had been a bit different, and a slow grind of years and achievements that never come.... Lady Bird is a young, exuberant fool who is just starting to ram up against those disappointments in life. The mother has had plenty and they have virtually pickled her at that point, they are oozing out of her so intensely. She is overworked, coping on behalf of a depressed spouse, stressed, and bitter. Her daughter's dissatisfaction with their life kicks her over the edge repeatedly, not that the things she says help at all.
I really enjoyed the performances and it was honestly hard to watch at many moments, but in a good way. The either warmth or disconnection between characters was palpable and well played IMHO. You honestly wanted Lady Bird to wise up and enjoy the people that enjoyed her more instead of trying to be something else, but it's a process. The nature of family as dysfunctional but necessary against the cruelties of life is portrayed well. Even if you are at odds with those people they are still better allies than most of the rest of the world.
I would watch it again. It's quite therapeutic.