It's somewhat the same for me. It falls under hygiene & cleanliness for me. Though i'm always in control of it, like eating at relative's etc., i wouldn't eat from a bowl if leftover from someone's plate was added to it, or the cook has long fingers etc. I wouldn't eat his food.
Luckily, most close relatives are fairly clean when it comes to cooking. Though for other stuff like utensils, cups, plates, spoons, forks etc. I always inspect them when i'm at someone's house, before eating from/with them.. The same for chairs, tables, sofas, etc. I have to check it, and brush it off or clean it with my hand to ensure there's no debris before i sit..
It falls under hygiene & cleanliness for me, like i wouldn't go out with my home clothes to a public place etc. Or when going out using public transport or public chairs, i have stay away from chairs because everybody can come and just sit on them. And this how i was long before Covid-19..
And when i come home wearing my outdoor clothes, i have to clean & shake it up just enough then i'd wash my hands with soap before i touch anything inside the house..
When it comes to food (and other things), my mom is the only one i trust because i know how careful, responsible and considerate she is. She values cleanliness & she doesn't cut any corners regarding that..
I hope my semi-rambling text gives you an idea that you're not alone in this.. and you're just very observant, you value cleanliness, and it's reasonable in thinking that other people that're unhygienic, they do what they do because they don't value cleanliness as much as you do..
