I work with infants and children, so it takes a lot to disgust me. You could vomit right on me and I would be annoyed at the mess, but not disgusted.
The only thing that really does it to me though it a big, fat, green booger where it's not supposed to be. Like on their cheek. Hanging out of a nose is okay, but if it's all juicy and on their cheek I'm gonna gag.