He can never prove her wrong though can he? Why play up to her bollocks? Because that's what he'd be doing. It wouldn't be for the direct benefit of his son.
Being calm shouldn't mean giving up your dreams because your ex is bitter and twisted.
It doesn't always happen that way, you know, and it's much harder for a nrp to "prove wrong" an rp who is a massive nasty bullshitter.
Ime dad cannot win here. He just can't.
Because by leaving, he is playing to her bollocks, she wins. She is 'proven right' like I say, it proves that what she is saying is true, that he's a bad person even when he isn't. It's what 'Disney dads' try to do, act like they are the fun parent and mum is evil and horrible, won't let you have any fun. Proven 'right' when mum says no to something. But it's still bollocks, and the child eventually realises that the no was in their best interests. Dad wasn't.
He can't win at the moment, there is no win here right now. There's only providing support. This problem won't be solved over night, in a year, or with holidays. It needs time and consistency, which you cannot give from a different country.
But what do I know, I'm just a troll apparently.
People's opinions don't matter at all unless they are married, didn't know that you became immediately wise once married. 