I brought in cupcakes I spit on for my class to share on my birthday
Why would you serve treats that you spit on?
It was only a little bit.
You should never bring cakes in to share that you have spat in. This is truly disgusting and you need to think about how it would feel if someone did this to you.
I do this ever year for my class. The kids like it.
Even if they like it, what you did was wrong. You should never try to share something like that when you know that your germs are baked into it.