I'm going to follow this thread, as my teens are so disrespectful at times, shouting and swearing at me if I say no or they don't get what they want. I don't shout nor swear but they can go on for hours and I can't remove their phones as they would literally physically hurt me if I tried , I've even tried physically disconnecting the WiFi and parental controls which they just reconnect or disable.
The majority of the time I'm taking deep breaths, responding with, "Don't be aggressive and don't swear at me" and walking away as I'm not arguing with a screaming unreasonable firecracker at that time who is itching for someone to argue with.
I usually follow it up with a text or WhatsApp that says same. and I repeat the record over.
Then I have something to point out to them (they deny it otherwise!! ) the next day or two when they are calm enough to talk to safely and with some sense of reason. It mostly works, as they feel bad and apologetic, but not always. But then, heyho, I just start again and move on, having pointed out what in immediate future I won't be helping them with if they can't treat me with respect and kindness. My teens, who are usually lovely, but not always, seem to gave a great line in acting shockingly entitled at times and get irate over reasonable requests and boundaries,
Good luck OP, hopefully others might come along with recommended texts or strategies .. (other than the 'remove everything they care about' suggestions which aren't as helpful as they might appear)