I disagree. A large portion of minimum wage workers are conservative. Look at the average income vs political leaning charts, or level of education vs political leaning. You're looking at a large proportion of min wage workers that see unions as an additional "tax" or "government type social agency".

It's really hard to convince someone that they will benefit from unions because they believe in a social hierarchy. Even though they're minimum wage workers, they believe that they're in the MIDDLE AREA of the social hierarchy. People below them include everything from criminals, foreigners, LGBT, illegal immigrants, single mothers, racial minorities, homeless people, poor people (welfare, destitute, etc ..). It depends on who they personally think is "below" them.

Conservative media has convinced these people that social programs and unions TAX THEM to benefit those LOWER THAN THEM in the hierarchy. For them to believe they would benefit from unions or government social programs, you would have to convince them they're in the class of people who would benefit. That means you'd have to convince them they're closer to the BOTTOM of the social hierarchy than they feel they are. It's telling them they're among the "takers" and not the "workers/producers". You basically acting against their self-esteem and notion of self-worth because it's based on the notion they're better than others and that socialism takes from the middle/top and only gives to the bottom, if they recieve, they must be on the bottom. This is the source of the cognitive dissonance that drives low income workers to vote AGAINST their interests

So I really think a decent portion of Amazon workers agree with this video and are concerned about unions and are going to report union activities to management.