Bashing mechanchim? Expecting mechanchim and schools to do right by the klal isnt bashing. Unless you live somewhere where he is speaking to the norm, in which case i feel sad for your options.
One does not have to be out of chinuch to have those opinions, and one certsinly does not need to be in chinuch to know what’s going on. Any friend, rav, therapist, neighbor, fellow jew can speak to hanhala about a boy they care about, or a concern they are having with a teacher, and hear exactly what’s going on. If you are oseik in those receiving chinuch, you are as well informed as you choose to be.