and also quite harmful to health?
I realise there's quite a fine line here and if we turned back the clock 50+ years then we would see an awful lot more children (in particular) being seriously harmed or dying of childhood diseases. So thank goodness for vaccines! But then those illnesses (like measles) didn't spread because of dirt in the environment, they were just nasty bugs that spread through human contact.
But now I see people worrying needlessly about the dirt in carpets, imagined dirt on things that haven't been bleached or wiped with an anti-bacterial wipe, not buying cakes at bake sales because "someone else" has made them, complaining about staff in food shops not wearing gloves, fretting about food that is on it's sell-by date, buying a thing called "laundry cleanser" I mean EH?
This is probably a question for non-Covid times. But, covid aside, aibu?
All the evidence seems to show that mild exposure to dirt and bacteria is beneficial to the immune system in the long run. Suffer some mild but irritating illnesses when young and build your immune system against the more serious ones.