Melissa,
Yes, generally true. At times I have been very ready for class but had students who were not interested in the topic or even paying attenion. Thieir disinterest was shown by talking, looking at other material, and not participating. That was a total lack of respect. So, I surmise that if we are prepared we might get respect, but without being prepared we definetely wouldn't have the respect of our students.
Barry Westling