Unless their behavior literally impacts you ("literally" to differentiate from one's thoughts or feelings; just because I don't personally "like" something someone else does does not make it my job to speak up about it). I am reminded of seeing trucks on a parkway where there are "No trucks" signs; it's not my problem, it's the State's/government's problem to enforce their signs, the signs aren't there for me and my "comfort" but to protect the road so it doesn't have to be repaired as often! The road and its repair are not my problem.

My husband smokes and I have asthma. That involves me and I have to decide how I wish to deal with his addiction, almost in the same way I would have to decide to deal with it were it my own. If he did not have that addiction, I would not have that problem. I cannot make him start/stop smoking but because I have chosen to be involved with him, I am involved in his addiction also in order to care for myself adequately.