Y r teenagers so spoiled now? Im only 20 but i feel like theyre all coddled and ppl make them get away w/ ever?

Im only 20 and if i ever talked back to my mom or got into trouble i was afraid to go home, I never got the "oh its ok shes a teenager " thing. I think teenagers are let of the hook of for everything just because theyre a "teenager", like whats up with that. If i wanted something i had to pay for it myself. I got a job when i was 15 because if i wanted something i had to buy it myself. (I have a single mopm so she couldnt afford things anyway but thats not the point of this). I liove in nyc and when i went to school i had to wake up 2 hrs early bc my school was 2 buses away. Like i was expected to listen to my mom and help her out i never raised my voice to her slammed doors like supposedly all these other kids do, i wouldve never gotten away with these crazy behaviors. And why does everyone think just bc ur a teenager its an excuse to hate ur parents or have an attitude,i always loved my mom and got along with her i actually liked spending time with her... anyway why is teens bad behavior excused and they never face any reprucussions... i keep reading things on how to understand ur teen and speak theyre language bla blah blah