Common Courtesy, Don't You Think?

A situation happened to me last weekend while showing properties to my client.  Just wondering if this frequently happens to others and how you feel about this situation. 

I work with my husband also a Realtor.  On this particular day we went out with our client together.  I was on one side of the home with Mr X and my husband was turning lights on and unlocking doors on the other side of the home.  Another agent and client entered the home and went to the side of the home my husband was on.  My client was unaware of the other people in the home. We worked our way to the master side of the home.  Mr X was very taken back (and jumped) when the two men came out of the master bathroom as were entering it. He stated that he didn't know there was anyone else in the home. Then he brought up an episode that happened 4 months ago when we were out with Mr X and his wife.  An agent that I am acquainted with entered into a home seconds after the door closed and announced that she was going to just snap a few pictures and be on her way.  It was very distracting for them and we were there an extra long amount of time waiting for her to finish so they could walk through the home again and talk about purchase options.  Should I have locked the door?  What if I was by myself with Mr X?  How safe is that?

I understand we are all busy. I have a schedule of homes to show.  Some of them are occupied with appointment times.  Is my client demanding too much?  When I am showing homes, if there is a car out front showing the property, I wait outside until those people finish or at least a wait a fair amount of time about 5 minutes or more  (I believe I have waited 15 max). If they still aren't finished, I go ring the bell and let the agent know I am waiting and still wait outside until they come out.  I have found this to be many clients preference.  Open houses are different. We know there will be an agent and possibly other lookers inside as well.  Most of the time when I take a client into an open house it is for comparison or curiosity. If they are truly interested we go back and look at it another time so they can place furniture and ask questions.  Is this too much to ask?