They don't have notices these days saying that spitting is not allowed in bars and buses. At one time they did, and they were needed.

I'm pretty sure there are still laws against spitting in such places, but no one sees that as an interference with their freedom. Or if they did, they wouldn't have much support from anyone else.

Manners change, and it's not all one way. In fact, if you go back to Victorian Times, there was in some ways much more recognition of the fact that smoking interfered with other people - there were smoking rooms and smoking jackets, and asking if it was all right to smoke before lighting up anywhere else in a home was normal good manners in "polite society".