First settling in session and worried

[Berangere]

DS is nearly 1 and had his first settling in session today at nursery and I was allowed to stay. All the kids in the baby room are mostly 1-2 years old; with one other baby younger than DS being 9 months old.
They all sat round to have their snack, and DS is throwing his sippy cup of milk around, eating a bit of biscuit then dropping it on the floor, refusing to eat the banana. The nursery workers looked mildly annoyed that he was doing this, and it made me really worried.
DS is not great at eating, he gets bored very easily and hates being sat down, can’t use cutlery himself (can sometimes put a loaded spoon in his mouth but if he’s not in the mood he will just chuck it!) and is really in a chucking and fussing phase. We have not had a linear eating journey as he’s already got 12 teeth and it feels like every week he’s off his food due to teething.
I am just wondering if this is normal regarding the chucking/being distracted or if I need to start doing things differently? I worry I’ve not done enough and have spoon fed him too much? I really sensed the nursery people were annoyed he wasn’t “behaving” better…

At nearly one, his behaviour is age-appropriate. Obviously not what one would prefer, and of course you'll want to be encouraging feeding himself/not chucking things/etc. – but it's age-appropriate. The question is how the nursery staff will handle it (and many other forms of normal young toddler behaviour that are equally normal, but equally undesirable).

What did they actually do today? Mildly disapproving wouldn't bother me – it is behaviour we want to discourage after all – but I would expect it to be a very mild, just part of the job, sort of thing. I wouldn't have wanted to sense that their emotions were getting involved over a biscuit on the floor.