Yes nic, because I think he is bad at teaching. Someone that clearly doesn't understand his own syllabus should not be in charge.
If he wanted to demonstrate the value of a symbol his words should have matched his lesson. Unless he was also trying to teach a valuable lesson on why lying is a bad idea. If so, he is currently doing a great job at teaching that lesson.
Again, you continue to assume that his words didn't match his lesson based on nothing more than a single statement by a parent who wasn't even there. That seems to be some pretty flimsy reasoning to judge him incompetent at his job.
"You have not converted a man because you have silenced him." -- John Morley
"I just helped your mother kill someone. That 'old lady' enough for you?" -- Tara Knowles