I guess it is just the way I was raised, but I don't understand the "keep quiet and walk away". ..
The OP provided nothing more than their personal opinion regarding what sounds like an over the top coaching style. And it is quite possible that some of the events are based on second hand information. I find nothing in the OP that rises to the level of ...save kids from being ridiculed in front of their piers [sic] or other forms of metal/physical abuse. In the absence of something objective like true mental or physical abuse, no action is warranted. Forego the drama and find a better fit.