Sure, it's entirely possible he didn't express himself as clearly as he should have. It's also very likely there have been private discussions and commitments made that he knows about and we don't.
Oh please. You're better than this.
I totally agree that focussing on whether someone has said 'thank you' is ridiculous.
With regard to your first point - I have no problem saying when I think Trump/Vance have done something right (I have done on countless occasions here) but I will also call out hypocrisy where I see it. "He didn't express himself as clearly as he should have" - why not apply that to someone speaking in his third language and under huge pressure, rather than someone who is speaking under no pressure to the very friendly Hannity at Fox. He should be much, much better than that.