Good points but I thought it was really interesting that it deliberately sidestepped the issue. As you say, it was implicit but not overt.
Racism has become a huge topic in media of late, and because it prompts such a strong response, it can often overpower things we can relate to and ultimately feel more attached with. It seemed like the main intent of Minari was mainly supposed to be about everyday problems happening within the family, particularly their uprooting and trying to begin a new life away from Korea (it could have been anywhere, not just Arkansas).
I suspect it didn't want to demean America (and hence the American Dream) because it was so integral to their sense of self-worth, especially as they battled through unexpected situations such as lacking enough water to grow the crops. If we're being totally realistic, we might wonder why that plot strand went nowhere. At one stage the girl turns the tap on and no water comes out - didn't the local water board sense something was amiss?
But I digress because I thought the levelling of prejudice was quite smart generally. Paul's character showed it as even his beliefs seemed a little extreme for the rural location. I think of the scene where the kids on the bus make fun of him. Even Jacob seems to go to this extreme, detailed by his reaction when he and his family are driving up the highway and see him towing the cross. He looks confused and it suggests some judgement.
Either way, maybe we'll disagree because I loved the subtle approach the film took.
Apologies also if any of this sounds garbled. I just woke up and am very much in morning mode.