One favorite saying that I repeat to students at our airport: "If you hang
around here long enough, you'll see something stupid happen every single
day." It's meant to keep students alert to what's going on around them and
to observe and learn from the mistakes of others. Hopefully, the student
will keep that in the back of his head and he'll ask himself "Is what I'm
about to do going to look stupid to another pilot? Is it stupid?" If the
noise abatement procedures are clearly posted and a pilot repeatedly ignores
the procedures for no good reason, then I would classify his actions as
described above and I can all but guarantee you that the well respected
pilots at the airport do not approve of it either. Should you resume your
training, your complaint may be met with more understanding by the other
pilots than by the airport management or the other officials. Peer pressure
can be stronger than official notices.

Good luck
Jim