General tolerance of dialectal variation does not seem, perhaps, much to
come to. However, any more formal approach (language drills in standard
English, formal guidance on "correctness" by the teacher) is not likely to be
successful and may in fact widen the gap between the non-standard speaker
and the school. We must allow children who have competence (passive, at
least) in the standard to choose for themselves linguistically (with an
abundance of models around them, of course, chief of which is the standard
English-speaking teacher).