... "He's just a baby and he's sick if he wants to talk to folks and get close, let him! You don't have to be rude to him!"
Yeah, right. If I'm sick enough to be in urgent care the LAST thing I would want is to be touched by an also sick toddler stranger, and I LOVE little kids! And if the toddler is sick, why expose him to other people's bad germs so that he can become even sicker?
Not only that, but not all people are comfortable around small children even in "good" times. If the person who rejected the child was one of those people, also sick and really feeling miserable, it is very understandable why being touched by a sick child would not be a welcome thing.
The person who asked the child not to touch her was not rude. The child was not rude because he simply didn't know any better. The father? Someone needs to talk to him!