I don't believe that's (the snack basket) explicitly laid out in their job description, per se.

I don't agree that this necessarily needs a TTU. If I really had an issue with it, I would have personally taken it up with the FA. Since we have no indication that any follow-up was made to the offending FA, that's where I'd put the focus on. If, after making the inquiry/request, one is met with resistance, then it's probably wise to follow-up with customer service or the in-flight people.

FA simply could have been having a bad day (we're all allowed one of those every now and then, right?) and could have forgotten or whatever. Unless we actually confront the FAs (politely and courteously, of course) when something doesn't seem right, we'll never know why and always assume the worst.