You wouldn't get an earful from me if you rang my club and asked us not continue a practise like that, but if I heard someone whinging about something we were doing and they hadn't bothered themselves to let me or anyone else know, then I'd be very annoyed.
We can't do anything to change procedures if we don't know they are wrong. Best practise says you should always try and contact people you may affect, and at my club we ususally do, but not everyone does. So take responsibility and try to fix it yourself and make your life easier.
We all have responsibilities in flying if we notice something awry, what if you had a student on first solo when some daft eejit in a spamcan decides to do a PFL onto the strip? If you'd done your best to stop this "habit" then you are clear, but if you hadn't an accident was caused, then you would have to take some of the blame for not fixing a problem you knew existed.
It sounds like I'm ranting but I'm not trying to be rude in anyway, I'm just pointing out that we all need to work together in aviation whether you fly Heli's, Microlight's, SEP (group A for Genghis!) 747's, glider's or even parachutes. So no "them and us" attitude, just a bit of mutual respect and clear communication.