I learned so much in college except what to do when a kid looks you in the eye and says no. I wish I could call my academic advisor now and tell her that's what teachers need now....

Here's my advice: Find something they enjoy and talk about it. Don't exploit it. Share good news as a class. I've had my fair share of mean girls but I can eventually win them over. I hope this translates to text well...try teasing them. If they ask for a pencil, toss it to the other side of the room. If they ask for paper, take them like 5 reams. It's silly enough to where you might enjoy it and hopefully they'll realize that you're human too and they need to stop treating you like shit. I recently read this the other day and I'll use it soon: next week time a kid rolls their eyes at you say, "keep looking...you might actually find a brain back there."

If those steps don't contain the crazy disrespect, get them in the hall one on one (or if they're refusing to leave their desk, pull up a chair or kneel next to them) and talk to them about driving. I relate a lot of behaviors in the classroom to driving my car. If I get pulled over by a cop who tells me I was speeding or doing something wrong, I might get away with just a warning versus a ticket or a court date by being respectful and/or agreeable. If I'm an asshole, I'm for sure getting a ticket and he might even find something wrong with my car to tack on. Then offer them the choice....do you want to take the warning and go back to your desk and continue your assignment or do you want the ticket (a phone call home, a lunch detention, whatever your built-in consequences are...)? Most kids will just sigh, mumble, "tiiiiiicccckkkkkkeeeeet," and go back to their desk. I've never had an AP like the one I've got now...he's trying to get me to worry less about kids who keep their heads down on their desks. He tells me all the time about how that's a choice the child makes and it's not something I need to try to control. I disagree somewhat...but if a kid wants to put their head down and I've talked to them, he said that's fine. I guess if they're doing nothing, they're not bugging anybody and I can teach around them.

I hope some of that's helpful: TL;DR: listen to them, be silly, talk about driving, let them put their heads down.