Please read the attached post by The Musical Daddy.
Let me extend this sentiment by saying to this mother: yes, I get that it's probably hard to be in the house with 4 children, 3 of whom visibly have the chicken pox. You've probably had a crappy week or two in your confinement and have been desperate for an outing.
Well guess what, you insensitive clod--particularly in today's culture of germophobia, you're really not welcome in a place such as the library, particularly when your oldest child hasn't learned the basic art of NOT coughing all over everything and then touching stuff. I'm not always a fan of the germophobia but it has caused people to be more hygiene-sensitive and it couldn't have come at a better time for our family. So while you may think that chicken pox is just an ordinary childhood disease and if people get it, oh well, it can be a BIG problem for some people.
And if you've been confined to the house for a little while, I suppose that in your world this is a big problem, and by the looks of it someone probably spent Christmas or at least New Years in the itch zone. I guess there's no way to make you understand that it's because of people like you that I have to keep my child in the house almost all of the time.
Musical Daddy, in his post, said that you suck. I'll echo that sentiment and add that I hope you are blessed never to understand exactly how much you ruined our afternoon.