i should say it 's not good for us.but it doesn't make sense.what i can do better is to behave myself and inluence my familliar person around me,like my relatives,and my friends. but to be honest,in the city,more people will pay attention to this impolite.but we ahve more popularion.and in rural,the people think it's ok.Not impolite.they have the custome to do something,like spitting,littering,and so on. My father can't give up smoking similarly.

I think its too bad .But I will do nothing .Althought i tell them it's bad for our society they won't change themselves.So i just can keep myself don't do that.Maybe education can improve one's quality.

well, I should say this is a very tough question. if you do say something, easily you may get into trouble, when the man is unreasonable. Actually, if they realised that such conducts are bad, they wouldn't do it.

Usually i frown, but sometimes i say something, like “hey, here's the trash can, why litter?” I think i should say something more often. Hope my location doesn't matter ;-)

我也很讨厌那类人，如果是认识的话，就会好心提醒。假如不认识，会被骂“狗拿耗子，多管闲事”的。