And - sorry! - I'm with her over the Christmas conversation.
It is totally appropriate for a parent to ask a 12 & 14yo about plans.
It is not appropriate for a parent to put them on the spot on the doorstep with "well you can do what you like, what had already been agreed with you, but I'm now going to make you feel guilty and torn right in front of the other parent by saying I want something different".
If that were my ex, I'd be cross and think him a cock.
Why didn't he contact her at the beginning if December to say "what shall we do this year, I'd like xyz".
She shouldn't be texting, calling, emailing... But my own situation with a lazy, weak, stupid ex pushes me towards sympathising that she feels she needs to!
Has he actually told her to stop with it all? Disengaged and not answered?
It seems he has 50/50 care and the boys are quite old. I'd be surprised if he had to worry about them thinking he doesn't like them.
He should set his boundaries and stick to them, and you shouldn't say "do whatever you want love" when you don't actually mean it! (And I'm not surprised you don't!)