Meth and heroin were massive problems in the 80s and 90s. Go and watch Trainspotting which was literally made in the year you mentioned and then come back and defend your point about public toilets in the 90s not being drug litter riddled.
When I was a kid growing up in the 80s/90s, you rarely saw homeless camps like they are now where they openly use drugs. You never saw public restrooms that were completely disgusting. Fast food bathrooms were clean back then.. now they are horrible. Things are not the same... The worst bathrooms back then were at the public parks where they were covered in pee and not cleaned well, but weren't destroyed by drug usage like they are now. I don't remember seeing piles of needles (or even one needle) like you do now.