Beauty and the Beast (1992) is one of my favourite films. I appreciate there are a few main plot holes but on rewatching it I think people who talk about it just being a Stockholm syndrome love story are oversimplifying the plot.
Belle is immature, wrapped up in her dreams and disdainful of the villagers at the start. She looks down on the provincial people which is not an attractive character trait. She longs to leave her small society where the only purpose a woman has is to marry and bear sons. She has flaws: she is rude and cuts off her nose to spite her face in regards to the dinner request. She disobeys the Beast's clear instructions about the castle in a deliberate way and invades his privacy. She is curious and nearly damages his most precious possession. She nearly leaves the Beast to die in the snow after he saves her (the hesitation is very clear in the animated film).
The Beast is immature, selfish and unkind at the start. He has been given power too young (here acknowledging the plot hole of him being cursed at 11 years old? for 10 years with no parents around) and is inconsiderate of others. He doesn't let a stranger into his palace (which again plot hole as who lets a randomer into your house - but fair enough princes should help the needy). He has a horrible temper. He is punished for that for 10 YEARS. When he meets Belle he is angry and traumatised and lashing out at a world that has been cruel to him.
He makes Belle his prisoner in a trade for her father that is again cruel but a slight softening since he does at least release Maurice to make it to a doctor. He is thoughtless when he doesn't let her say goodbye and he regrets the pain this inflicts on her when he realises he's been unnecessarily nasty.
The turning point for both their characters to improve is the wolf chase. She needs help (in the fight) and he saves her. He needs help (to get home and medically) and she looks after him. She realises she can thank him by teaching him to read. He makes an effort to become less physically repulsive (bestial) in order to make living with him easier for her. They spend time together and have fun playing in the snow together. He gives her a gift and listens to advice from his staff, valuing their opinions and treating them better as he becomes a better person.
He becomes less selfish and more caring of others. This character growth is summarised when he spontaneously lets her see her father (he'd been selfish before by not realising how much she missed him) and then, on realising he was ill, he lets her leave to be free. He knows he is sentencing himself to 'be a beast for all time' but doesn't guilt her into staying; he just wants her to be free and happy. His servants are appalled and shocked at how selfless he has become which shows his character growth is huge!
Belle's character growth is also big; she realises that her disdain for Gaston had actually stopped her seeing how villainous he was. She uses the Beast's image for her own ends and causes destruction to everyone. When she realises what she has done, she is distraught. She puts herself in danger to save the Beast, showing that she is now less selfish and cares for other people as well as her father. She is too late to save the Beast and he nearly dies (spoiler) because of her stupidity. She gets her second chance thanks to the spell healing his wounds which is just lucky, really!
YABU - It's just Stockholm syndrome, you need to get out more!
YANBU - It's about not judging a book by its cover as both beauty and ugliness can cover character flaws and a good personality or character growth will be rewarded in the end.