AIBU wrt to my DC missing out because of his allergies?

[WellSlapMyThighAndCallMeNancy]

I have a toddler with many many allergies. Mostly quite serious.

We attend a brilliant music group which he loves, the woman who runs it is absolutely brilliant. Its one of the few toddler things-to-do that I actually quite enjoy and not cringe my way through.

Since starting last summer, my son has changed from a very shy, frightened child who'd cry if another child or stranger tried to engage with him - to a happy, confident, outgoing toddler. Ive no doubt regularly going to this class has helped (theres a lot we cant go to because they have children walking round with food).

2-3 times a term, the lady uses feathers in the class for 3-4 minutes. If my DC goes anywhere near feathers he breaks out in hives, let alone handles them.

We used to leave the room during this time. But now he gets upset, he doesnt understand why Im dragging him away from all the noise and fun.

So Ive asked her to let me know the week before she uses feathers and we'll not come that week. She agreed and said she email me.

Except I was secretly hoping she'd say she'd just not use them. Theres so few groups we can go to, now 2-3 times a term we cant attend this one.

I dont want to drag my son out the class, its making him feel excluded. I hate that. I hate that fucking, bastard, bastard allergies means my lovely son see's and feels excluded from things.

AIBU to wanted, slightly expected, her to just say she'd not use them?

I really need to know if AIBU because this is just the start of situations like this, I know.

[ENormaSnob]

If you don't want to ask about not using feathers or using fake ones could you not just remove him for a few minutes and distract him?

At least he doesn't have to miss the whole session, only a few minutes.