I think Holden has a lack of respect for authority because he thinks that he is always right. I also think his lack of motivation also comes from the fact that he thinks hes always right. Especially with school, he acts like he doesnt need it and that he is already smart enough so he doesnt care to try at all. I think he is very ignorant.
I do think this does apply today with teenagers, many of them dont respect certain people in authority because they believe that they are always right. Today I think teenagers lack of motivation comes from ignorance, but not as much as Holden. Teenagers today try to act like they know everything but i think many of them just dont care as much as they should when it comes to school.