Sure. “I wasn’t hungry” is a reason, and there are infinitely many other possible reasons.
So, as I said, nothing is forbidden, everything is permitted. Jabbering about your Walkman dying because the Energizer Bunny didn't keep going and going and going, so you'll have to swing by Walmart and maybe pick up a Dr Pepper and some Twizzlers is
perfectly acceptable because, well, there could be
any reason at all why someone might say such things on a planet with no relationship to Earth and no such things as Walkmans, Energizers, Walmarts, Dr Pepper, or Twizzler.
Again, who gets to decide if the action has an in-character motive, and if it isn’t the person playing the character, why not?
Either the DM or the table collectively. Who else?
To turn it back on you, per the intentionally facetious statements above: Why do players get to abuse such latitude whenever they like, however they like, to their utmost advantage, despite it being rude to the other people at the table
and completely destructive of the experience?
Two can play at the "let's make every possible presumption to support myself and thus deny everything the other side might comment upon."
The decision being made “suddenly” is not explicitly described in the example.
Really? That's certainly how it reads to me. Not a whisper of it, and then immediately after the saving throw,
then and only then is opposition voiced. Sounds explicitly sudden to me. We of course can simply ask
@iserith if it was sudden or not.
You legit don't see how people can be verbally polite or non-aggressive and yet still be suspicious of strangers?
No. Not in this context,
especially not when it was explicitly said that hospitality is a big deal in this culture.