To expect farmers, who may not have 3 meals a day, to have 儀態 and 禮貌 are totally overkilled. The writer of this article must be educated but not knowing how the poor lives.
Instead of whining at farmers being impolite, with his education he should encourage the government to subsidize the farmers. Hence, when you don't need to worry about your meal tomorrow, you may take the risk to spend time on eudation and have 儀態 rather than farming.
If they cannot even sovle their survival problem, asking them to be 有文化 is impossible