To be annoyed that we're now all ill because of a friend's thoughtlessness?

[giannna]

A friend invited us all round to her house on Sunday. She has 2 DCs. We stayed for about 2 hours.

Yesterday my youngest DC and I came down with a stomach bug. DS is ok today but I am still feeling really weak and unwell and have been in bed all day again today. DD has also come home from school today feeling unwell and very pale.

I told my friend via text that we were unwell, and she replied "The boys were both sick on Saturday night, we probably passed it onto you, sorry".

So they were both sick hours before we went round to her house, and she didn't think to mention it!

AIBU to be really pissed off?

Yanbu it's a really selfish thing to do.

I would be raging.
Have you told her because I would.

It is really thoughtless. You could have unwittingly passed it onto someone for whom it had serious consequences. At the minimum though it's a horrible thing and a real inconvenience. As she should know.