I'm surprised people are so judgmental there. In my experience (having worked a lot with tourists) Chinese people were noticeably inconsiderate in public, like farting, spitting in public etc. Maybe I'm generalizing but there really was a noticeable pattern.

I think it's surprising that this is such a hangup for them especially outdoors.

I've never smoked but I don't mind if people do and I find all the health and safety rules a bit annoying these days. I miss the smokey boozy bars way after closing time. These days everything is so clean and regulated.