I, too, am appalled at how much some people can't stand playing with beginners like david14700. part of being a true athlete is helping those that are just beginning and give them a good impression of the sport. those who pound the shuttle down and look around like they don't care when they're playing with beginners are arrogant, and are probably not that great themselves. the best players would not do that.
i understand and agree with the fact that if you want to improve, you play people better than you, it was stated on the first page of this thread. mind you, (i think this was stated as well), those beginners are definitely going to improve by playing with a good player and as a better player who was once a beginner, i think it's pretty selfish if you do not play with a beginner who wants you to play with him/her or make it look like you are so much better than they are because they will simply be turned off by the sport.
we were all beginners at one point, none of us were born with some kind of natural ability to play the sports, you don't need to be a rocket scientist or a nuclear physicist to know that.
on to other things:
about the issue of shouting, some players just do that to pump them up. i do it all the time, it pumps me up, there is nothing wrong with it and there are no rules against it unless it goes excess.
nylon shuttles suck!! i totally agree with Phil on this one, they move so much differently than feather shuttles and almost everyone can make a good or okay backhand shot without much technique using a plastic shuttle.

one time, this guy said that he was going to propose an idea to IBF to save money by switching to plastic birds, i laughed my head off sooo hard!! imagine pro badminton with nylon shuttles!!!
hypnoweb, people who smash like crazy and try to act all good in warm up are just going to tire themselves out, that is stupid of them to be playing like that and it's only going to work in your favour in the match when you are playing them, so it's all good isn't it?
Just my two cents.