I’m not quite following the question. This was posted in the General section, so I’d like to answer it correctly.
Is it weird to walk by people pretty much anywhere, look at them, and smile when you’re walking by? The real answer is, yes, it can be constued as weird to do so, depending upon which country you are in and what their culture is. Drill down further, and there are the different types of personalities; some are more friendly, positive and outgoing than others.
Take it down to the next level, and there are people who may become a bit paranoid by what they consider being overly friendly or those who truly are overly friendly.
Eye contact and body language can be exciting or scary or a gamut of emotions that fall inbetween.