I agree that sometimes it is better to not call attention to our behavior, because let's admit it, at times it is perhaps because we WANT the other person to see us being Orthodox. "Look at me, I'm Orthodox! I want you to ask about it!"
And that's not an evil thought in itself, if you really want to share your faith with someone else. But we have to be careful that we are not doing the sign of the Cross or any other practices for show. Sometimes I cross myself or I say, "Lord have mercy!" without realizing it. Sometimes, when I'm with friends, I am so eager to discuss Orthodoxy that I want to blurt out something about my fast or try to weave it into whatever we're talking about. That's not a bad thing but it can come off as very prideful (not to mention that I'm not actually giving them my full attention).
My husband and I went out with some friends this weekend, and we were discussing beforehand how we didn't want to bring up the subject of fasting. However, we are meat lovers, and some friends were confused about why we were ordering vegetable dishes. They asked us, and we answered their questions and let the flow of the conversation continue as it did.
While we are so excited about these new discoveries, we want our friends to be naturally curious because of the light in our eyes, the smiles on our faces, the hope in our hearts -- we don't them to ask because we are consciously integrating Orthodox traditions and behaviors into everything we do, making it obvious.
Some friends wanted to know more about the faith and we told them. Others didn't really want to hear about it. God may present an opportunity for the latter, or He won't. But I'm not going to push it by shoving my faith in their faces and forcing them to discuss it.