I was doing a quick shop with DD2 (10 months) sitting in my trolley. While dashing around the veg section, I noticed another child of a similar age about two aisles away with a face covered in (chicken pox?) spots. I'll admit to a "hmmm, when is it that kids are no longer contagious?" thought process but I'm pretty sure I didn't stare - I've no idea if it was a boy or a girl, for example, and I certainly wasn't close enough to see the state of the spots. A minute later the mother accosted me and said I'd been looking at her child "with disgust" and that the child was no longer contagious. I explained that I hadn't been judging, it was just basic hazard awareness when I was out with my DD. I probably phrased it undiplomatically, and I'm sure she was just frazzled and feeling defensive, but that fairly accurately sums up my thoughts - I will instinctively notice an obviously ill child when it is in the vicinity of my own child. I will not stare but I will 'clock' it as a potential hazard. Am I being unreasonable?