Talking to people about Bitcoin is a normal way to promote Bitcoin and that's the only way I have been using to promote Bitcoin. I don't bring it up unnecessarily, I just wait till they start discussing something that is similar to it, then I will cut in and mention bitcoin and ask them whether they know about it. There are some of my friends that have seen me going through my Bitcoin wallet on my phone and they will ask what the application is and then will tell them it's a bitcoin wallet and also take my time to explain everything to them.

If bitcoin is really helpful to you then why not make bitcoin helps your neighbor or colleague or friends or relatives? When more people adopt bitcoins, it will be helpful for everyone. Definitely a win-win situation for all of us.

Yes, promoting bitcoin must be a basic responsibility for all of bitcoiners. Unfortunately most people never realize this responsibility because one probable reason could be they want to stay anonymous to avoid all the possible problems if they announce that they are saving/using bitcoins.