Why do teenagers become disrespectful?

[specialmom]

Is it a right of passage of teenagers to think it's okay to speak rudely or roll your eyes at your mom?  I try not to allow disrespectful behavior but it still happens.  I used to be a saint and considered knowledgeable in my home.  Now, I'm not so smart and a pain.  And so many other moms of kids my kids age are saying the same thing.  Is this a stage?  What does it mean when very polite and loving kids turn into know it all teenagers?  

[RockRose]

You need this,  SpecialMom.  I needed it when I was experiencing this.  7 minutes,  it will change your perspective.

https://www.youtube.com/watch?v=olSyCLJU3O0

[specialmom]

All these years, RockRose, you come through for me.  :)  I'll check the youtube video out for sure.  If you say it is helpful, I know it will be.  I'll report back my thoughts.  Parenting teenagers is not for the faint of heart.