Yep, I'm sure some don't even wash their hands after going to the loo.

Just one quick thing about the bacon being partly cooked, so they argued it was ok to eat (I guess this comment didn't refer to pregnant people): meat doesn't need to be cooked to be ok to eat. Prosciutto isn't cooked (apart from prosciutto cotto). Neither is salami (well, there are a few spacialty "cotto" cooked Salami varieties).
Bacon and ham are both cured, some are also smoked. So really, eating bacon raw is not much different than eating ham, it's just a different cut.

Although you are definitely right about eating while working with food being unhygienic, this doesn't really relate to listeria. The listeria bacteria is mainly found in soil and stream water. It can then be transferred to plants and lifestock. You can contract listeria by eating unwashed vegetables, gardening. And of course by eating the meat of infected animals or through cross-contamination.

Saša