@proulout To me that just screams incompetence. I've taught math to kids and it's pretty easy to do so as long as you make the subject interesting. If you're just fulfilling a quota though and regurgitating the material in the textbook then it's pretty obvious kids will not be interested. If a grown up man, with all his experience advantage, cannot teach children without requiring corporal punishment then he's simply not cut out for this profession. Unfortunately this has become the norm and not the exception, and the majority of teachers (based on both personal experience and statistics) are simply incompetent, and to complement that there are no robust enough measures in place to measure their competence (not to mention that there aren't enough 'good' teachers either, so beggars can't be choosers really).
If you have a PhD in math and have actually done the effort to study pedagogy and read the recent literature on the subject then I can guarantee that you won't have any trouble not only with teaching kids, but also teenagers, and even uni students.