The word that best describes Michelle Obama's tone in this statement is "critical."
The explanation for this answer is that Mrs. Obama is criticizing how some parents do not follow certain behavior but expect their children to follow. She criticizes the fact that parents do not see that their children can make the same mistakes as they do, if they are not a positive example.
Sad story. When I was in kindergarten my teacher kept telling me to wait and sit down when i needed to go to the bathroom really bad so I peed in the chain and she had to clean up my pile of pee. :)
