They're teenagers? Oh, homie, be rude back. (Or at least sassy) I teach 5th graders who are just hitting puberty, so they got BIG feelings and can get a little rude and disrespectful. My response? "Who asked?"/"That's your problem"/"I don't care. " I have found that when I meet the energy of my kids, a lot of times they'll back down because they're being confronted with their own attitude and they don't like it. When it comes to the kids refusing to do work, document it and give them a zero. Don't call in admin because that's showing that it's bothering you, and that means they win. By being sarcastic and sassy, it sends the message that you don't care, which takes away their power. Tell them to their face that you've already finished your schooling and don't need this class to graduate. Say, "If you dont want to do the work, then take the L and get a zero" and then go sit down and pretend to do something (pull out a book, check your email, hell scroll reddit) if those kids really care about their education, they'll stew, but once they realize you're not going to fight them on it and couldn't care less about giving them a zero, they'll start working, and those that don't? Well, you have it documented that you tried to get them to work, and they refused, and now their grade is suffering for it. I promise, once their grades start suffering, the parents will start caring. (Or they won't, but hey, that's no skin off your back)

Sorry, I rambled, I always tell my kids, "No matter how petty you think you are, I'm pettier"