Stroppy teen vs Xmas

[goldface]

My DS 15 has been so rude over the last couple of days, if he is not on a screen then he winding up DD, making 'jokes' that are actually quite annoying to everyone else and answering back v rudely if challenged. Last night he went way too far and really made us v angry but we were on our way to a family do and has to all go together and put a smile on.
How do I manage his behaviour, everyone's feelings, and try and have a happy Xmas??!!

Don't give the little shit any presents?

What are the consequences for his shitty behaviour?

Usually we take his phone away and or ban him from the pc for a period of time?

Nokia brick is a great idea thank you
He is a nice, kind kid but I am shocked at the comments he mutters and spits and at how disrespectful they are? Not necessarily in a parent/child way just in a human being way ifykwim?

Consequences
Talk when everyone is calm about how his behaviour isn’t acceptable and why.
How it makes people feel.
Lay out consequences before the behaviour happens when you are calmly talking and then enact them immediately the behaviour occurs.

Teens and toddlers same behaviour patterns

It's so frustrating isn't it? Once everyone is calm we do talk through things and he says he understands
But it is v hard work to get him to see anything from anyone else's perspective
What consequences do people use? Other than grounding/loss of phone?

I love the Nokia brick idea

No tv/ Netflix
What would make him listen- where is his weakness so to speak?

Have said no tv/phone/pc today. Am hoping a day of boredom might help the consequence of being so rude to sink in?
I think is real problem is to do with immaturity/lack of accountability? He always blames everyone/everything else for his actions? Once he is calm and we talk it through he understands and is sorry? But in the moment he just says and does what he wants? He does have empathy but in the moment just satisfies himself?

We have the Nokia Brick too! I thought I was just the worlds most unreasonable parent (according to my youngest DD) but it seems apparently not!

His brain is fucked due to teenage neural rewiring, and he currently doesn't comprehend social graces directly. This is no excuse. As a thinking being he can be trained to curb his smartass mouth though, so keep at it.