These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Woobie: Buck never does anything in the movie or in the backstory to justify the obvious contempt in which he is held by his entire family. Indeed, everything he does indicates that he is at heart an intelligent, caring man who simply acts unusual in response to being treated like a pariah.
Moresoever, his unusual behavior consistently proves necessary to prevent the disastrous consequences of him being ignored- up to and including an attempted rape which he clearly saw coming.
While Buck wasn't exactly living a very good lifestyle... among other things, his only income was gambling (apparently also involving fixed horse races), the fact that his sister-in-law treats this like he was some sort of low-life criminal mugging people at gunpoint reflects much worse on her than it does on Buck... as does the fact that his own brother never stands up for him.
Tia is a Jerkass Woobie, extremely harsh and critical to everyone around her, especially Buck, but is extremely depressed, bordering on clinical.