Hmmm, you must live in my life.
My 14 year old and I sat down Saturday morning and had a talk. He has been disrespectful, rude, and outright lazy, the past month or so. Prior warnings, fussing, and threats had come to nought and I was done. He knows the rules in our home - he has just been choosing to ignore them.
So, I laid it out for him - went over the rules, outlined the consequences, wrote it all down and posted it on the fridge. I.e., rude answers/disrespectful words, no response - electronics get pulled for a week. Chores not done (especially taking care of the dogs) - electronics pulled for a week. Once the week has passed, return of the electronics is subject to the prior week's behavior - if no improvement, then no return. And so on and so forth.
So, make the rules, sit down with your teens, and calmly and gently explain the rules and the consequences. . Stick to it, don't back down. Teens do think they are special (I remember when) - and since they are our teens, they are special to us. But, they are not entitled to anything beyond what we provide for them. Electronics, rides to school instead of taking the bus, mobile phones, fancy labels on clothing, allowance, etc., are things that we decide to give to them - and are all things that we don't have to provide if they treat us like a servant and a cash cow.
Do they have chores? Mine does his own laundry, dishes, mops, etc. At this age it is time to be a contributing member of the household. Having them assume some of the responsibility for the workings of the household teaches them life skills and to value those things/services that you have always provided for them.
Before everyone thinks my house is all posted rules and no fun, my son and I have regular movie and game nights, sing goofy songs, and play chase down the hallway. I know that he loves me - but while trying to find his way in the world, I demand he treat me and our home with respect.
Good Luck and God Bless, and may we all survive until they are 25.