Like, trying to get those who primarily sell to working class folks to see how raising the minimum wage actually benefits them, because it means that all of their customers have more money to spend is nigh impossible. All they see is that they'll have to raise prices, and it makes them even more hostile toward their employees.

Yeah this argument never really made sense to me. Unless your product's only input cost is labour (which I can't think of a single job that would apply to, let alone close to minimum wage job) your costs should only have to go up by a fraction of the minimum wage increase. This would leave a minimum wage worker/customer better off after buying your product than they would have if it was cheaper.