I'm going off Wikipedia here, which says the kippah is worn by Jewish men to fulfill the requirement that their head be covered at all times. Sounds pretty religious to me.
If the course was optional, I'd say you shouldn't have said yes without being prepared to wear it.
If they allow you to wait outside, do so, no big deal.
But if this is a mandatory part of the course, then I think it's within your rights to refuse them.
I'm bothered by the number of people in this thread who think that you should do it because "it's just a hat, get over it".
It's not just a hat, and it's not just a custom; the physical nature of the item is irrelevant, it's the principle of the thing. Wearing a kippah is a religious practice and he does not share that religion, therefore, he should not have to wear it.
If the course was optional, I'd say you shouldn't have said yes without being prepared to wear it.
If they allow you to wait outside, do so, no big deal.
But if this is a mandatory part of the course, then I think it's within your rights to refuse them.
I'm bothered by the number of people in this thread who think that you should do it because "it's just a hat, get over it".
It's not just a hat, and it's not just a custom; the physical nature of the item is irrelevant, it's the principle of the thing. Wearing a kippah is a religious practice and he does not share that religion, therefore, he should not have to wear it.