I've only ever had contact with one and he was a dick. Very condescending.
My friend was in a 20-year relationship with one. He's a psychopath - and he agrees!
But then you have the idea that feelings can be medicalised, that someone living on the poverty line, working full time in multiple zero hours contracts with an elderly parent who needs care plus children is depressed because of a chemical imbalance. They may have one, who knows, but it's far more likely that the reason they feel shit is because of abysmal life circumstances, not because they have a clinical problem.
And then you have people who have multiple different diagnoses for the same symptoms and therefore medicalised treatments - because each psychiatrist sees their state differently and refuses to be wrong/compromise.
The Body Keeps the Score and Drop the Disorder are both books that may help you understand the problem with psychiatry and therefore why psychiatrists say what they do and why they are disliked.
Saying all that I know someone who has an amazing psychiatrist, who has really helped her. He is interested in the whole person though and not diagnosing and/or prescribing. And he listens and engages with her. She lives abroad though.