It IS distressing, and I have children who have been in that position, and have complained to schools about it. I also have family who wore the yellow star, and there is NO COMPARISON at all - the two situations are universes apart.
A child who can't donate to whatever is at slight risk of some minor embarrassment while continuing with their day to day education
A child wearing a yellow star was likely to have all education and medical services withdrawn entirely, or watch the individuals who tried to continue to teach or treat them being publicly shot.
and the children wearing stars would be at daily risk of hunger, violence, arbitrary shooting, bereavement, homelessness, torture, imprisonment and for many, eventual death.
Children who wore the yellow star 70 years ago have still carry physical scars today, as well as memories of the horrendous deaths of loved ones that didn't survive. I have relatives who had a limbs severed without aesthetic. For experimental reasons. Only one survived, and she lives without the limb, and the memories of her siblings bleeding and dying in the days after.
I don't really see how this can be equated with having to wear school uniform on a day when others don't. Particularly as it is not likely to be enforced, and particularly as there will likely be others who choose to , anyway.
I get that you didn't mean to be offensive. But actually, in my heart, I don't really get it. I don't see how anyone can equate these two things, angry as I was at my son's school for a system that publicly singled him out as an individual that could not donate one day. He's forgotten it I think. He was mildly annoyed on the day. My aunt has been crippled and traumatised and bereaved for life. That is what the yellow star meant.