Another sign of disrespect, although I think it for the most part unintentional, is checking one's cell phone during class. I understand emergency situations happen, but still the focus should be on training, not what missed calls you might have.
Well Jen I happen to have a child on the spectrum of Autism and many issues have come up from time to time with child care providers and at school so I for one do occasionally check my phone and everyone who has been around a while knows exactly why. I have not noticed that to be an issue however at the dojo with the rank and file, at least during the classes I have attended or taught. So obviously with the appropriate permission and understanding it may not be so bad.