From another list:

Over the years I've had newer hams ask me about disappointing stuff they heard on HF or on VHF repeaters and I would tell them they should try to emulate John ON4UN's wisdom as captured in the IARU 2008 Ethics and Operating Procedures for the Radio Amateur - even if many don't and even if you don't follow every item. It's kinda like trying to be a good CW op even if many others aren't. If you hear stuff not living  up to ON4UN's standards, twist the dial and move on.
 
An excerpt:
 
•Some subjects which are a no no in amateur radio conversations on the air are:
–Religion.
–Politics.
–Business (you can talk about your profession, but you cannot advertise for your business).
–Derogatory remarks directed at any group (ethnic, religious, racial, sexual etc.).
–‘Bathroom humor’: if you wouldn't tell the joke to your ten year old child, don't tell it on the radio.
–Any subject that has no relation whatsoever with the ham radio hobby.
 
73 John K3TN