Back in high school I delivered pizza for roundtable. Actually a great job for a 17 yr old. Tips were great!
Anyway, some of the guys in the kitchen were disgusting. This roundtable required everyone in the kitchen to wear gloves. Regularly, multiple times a day, when these guys used the bathroom, the simply wouldn't take off the gloves. They'd go do their business, 1 or 2, with the same gloves on they prepare pizza with. Then they figured because they were wearing gloves, no need to wash their hands! So by the end of their shift, you can imagine what filth was on their gloves. Multiple trips to the bathroom worth.
As an aside, I do find the lack of courteousness from others in regards to washing hands quite revolting. One of the dirtiest things in a public bathroom is the inside door handle. So even if you wash your hands, touching the handle on the way out negates the soap you just used. I use a paper towel and just toss it in the garbage after opening the door.
BTW, two of the dirtiest things out there you may not know about. Women, the bottom of your purse. Tracks germs everywhere. Also, the handle of grocery carts. Saw a study a little while ago that over 90% of grocery carts have fecal matter on the handle, partly because of children sitting their and resting their hands on the handle. Nasty, but good to know, since you're usually handling your food at the same time.