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There seems to be a consistent theme of employees being treated with suspicion, condescension and outright hostility.The reason for that is simple. For jobs with few qualifications, undisciplined people and people who struggle with thinking are in the highest supply. Ask anyone who operates a bar or restaurant what sort of behaviour they can expect from low-qualification employees, hired without significant attention, at the going rate.
It may be a matter of privilege for a lot of people; I know many brilliant and well-intentioned people who have had a hard go of life because they picked up a counterproductive fear, insecurity, or opinion when they were young, but it would not surprise or offend me that their employers would grow to dislike them. I have had some advantages on this, because I was blessed with a referral for my first job, and my first colleagues guided me away from my self-destructive behaviours (I was 17).
That's not to say it's all of them, but if you hire people for work that requires little or no discipline to meet the hiring requirements, you are going to be exposed to a lot of candidates who lack discipline.
There are many people working jobs that have a low- or no-skill entry level, who are incredibly hard-working, disciplined, and passionate; but there are also many who are none of these things.
You can observe a maybe-similar effect with specialized "consultants", who merely have to claim to be able to resolve problems like one you're experiencing; then they get paid for a few months to have a go at it, and it turns out they don't know any more than you do about your problem.