User - sympathies over what your daughter has been through. Unfortunately there are bad apples in any profession.
But this: Makes you wonder why they're in the job if it's that bad!
makes it sound as though you don't believe it is that bad. That teachers are lying or making unjustified claims about the job being hard.
Lots of them are not staying in the job. One of the reasons why kids like your dd are more likely to have to put up with a bad teacher or an unqualified or inexperienced one is that there are not enough teachers to choose from when schools recruit. And many of the good ones don't stick around.
The best way to get good people into teaching is not to vote in governments who increase their workload, impose crazy and unattainable targets, micro-manage them and devalue their profession by letting academies employ unqualified teachers. Oh and not slag them off constantly on social media.
People can disbelieve teachers' complaints if they want, saying it's no harder than any other job, and continue to smirk about long holidays, but the recruitment and retention figures speak for themselves. People will be smirking on the other side of their faces when their kids have no decent teachers left. You can't persuade teachers to stay in teaching by telling them they are wrong about their jobs!