Guides make a living from customers willing to pay to have a great day. I can totally understand why they would be defensive and want to set the facts straight to protect their livelihood. Anyhow, lots of people out enjoying the outdoors these days in the popular spots. I've found that if I assume there will be others ahead of me and plan accordingly (i.e. have patience, enjoy the scenery, etc.), I seem to have a more positive experience all around.