I've only run into one or two of these types. My favorite thing to do is to do exactly what they are telling me to do and just wait for sensei to come over and lecture me. Then I just stare at them accusingly and say but he told me to.....
I had the pleasure once of seeing one of them get thoroughly dressed down by sensei... who just happened to be Mary Heiny.
Hehehe- I've done that too!
This is BTW a really good thread.