An Old Joke Taken Seriously

When George Bernard Shaw wrote
'Those that can do, those that can't teach'
that was his idea of a dry joke, which proves
how some jokes age badly and still get retold.

But he was also reinforcing through the hope of art
that well known hierarchy where the rich and self educated
define everyone else, particularly the poor - whom they divide
between the worthy/semi skilled (the teachers) and the unworthy
(their pupils who for lack of space/materials will never be skllled)
all the better make pupil and teacher co-dependent on each other
and make each blind to how thoroughly they are divided from above.

All of this helps keep the riches of the wealthy well hidden
-except for when displays of old bling confirm old defferences.