I have a few questions for you guys:
1) how do you eat at a restaurant? do you clean your cutlery before eating? how about handling salt and pepper?
Restaurants fortunately have standards and the cutlery is washed. However, if I get greasy cutlery/crockery with blatant evidence of not being properly cleaned, you're mad if you think I'll use it. That's when I walk out.
2) what the hell do you do on holidays at hotels? do you sterilize everything or what?
Considering everything is laundered, I don't get your point? Unless you go to some seriously dodgy hotels with stained linen?

'
3) what about other peoples car doors? do you also kick them open and closed or use toilet paper?
Hyperbole. I'm yet to see anyone pee on their car doors.
4) how the hell do you handle coins/change?
Er.. I wash my hands after using them. Like, you know..
you should?
and finally, I hope none of you guys use the back door, as that will seriously contradict all the effort you guys are putting in just to take a wizz.
Considering it's my own "back door" and that I
wash, I don't see how this is in any way relevant.
There are simple standards of hygiene to maintain. Washing your hands after using a bathroom, avoiding touching things you
know people who
don't wash their hands make use of (people like you

), and if you are in town and need to dirty your hands that you avoid touching your face, food, etc until you've been able to wash your hands.
You have no idea how easy it is to avoid most illness just by having decent standards of hygiene (gastroenteritis, herpes simplex--fever blisters, warts, etc--, conjunctivitis, etc).
It's not about going
over the top like someone with chronic OCD, it's about maintaining your health and by doing so simply
keeping your damn germs to yourself.
Simple, really.