> I don't really understand why it is so hard to understand not to do (what I consider to be) impolite stupid shit.
Tip 1: Starting off by denigrating folks who do this is not a way to make people change. More often than not, it amplifies the behavior you don't like.
Tip 2: It helps to indicate you understand the perspective of why people do it before asking others to change. Reading your comment, I really doubt you understand their perspective.
People listen to those willing to understand them.