The point is, aside from just being unpleasant to be around, you are teaching your child that they do not have to be respectful. You are teaching them that the world is there to cater to them, that everyone else’s experience means nothing, and that whatever rules may exist do not apply to them.
We rip apart young people for not working hard enough or not having jobs and then we rip them apart again for working hard and having jobs. How dare this generation not support themselves immediately out of college! How dare they ask their parents for money! How dare they have massive student loans! Wait, what? A young girl has a well-paying job and acknowledges her debt? BURN HER, FOR SHE IS A WITCH.