Friends not washing hands :/

So I hosted a slumber party at my place and all of my friends used the bathroom at least once and none of them washed their hands...😳 My mom owns a restaurant and ever since I was a little girl, I have washed my hands every time i use the bathroom or before I handle food, etc.
etc. because I don't want to get myself or others sick, so it really kind of grosses me out when I see people skipping the hand washing step. 😷