I think it depends on the situation. Standing in a doorway or heavy traffic public place while you smoke? You're kind of a dick. Flicking your finished cig wherever the fuck you feel like? Dick. Having a smoke and then afterwards getting way too close to someone when you talk to them? Gross. I have a coworker who does that last one. Nearly puked the first time he stunk so bad. Privately told him afterwards so as not to call him out in front of people. Still does it from time to time.