Phramacuetical salemen

As you know, I live in the heart of the Bronx. To some its the "hood." Why did the first part get drop? The tenants in my building are very neighborly. For instance take the case of the pharmaceutical companies. One day, you see a guy- he may be cute, a lady who looks kinda sketch, a kid looking too young to be outside at 11 am on a school day or guy you never notice until he helps you with your bag or plays loud music as you two ride the elevator. The interesting thing is at some point you realize s/he is a salesman and you mind your business.

Nothing new, today, I was walking into my building and a guy whom I've seen in another neighborhood in the Bronx was coming into my building. Seeing him made me stop.  I had a heavy box and he asked if I was also coming in. I replied no, not right now. I wondered to myself... am I only neighborly with my local salesmen? Why did I feel cautious around him and not others? Was I embrassed for him or myself? Why didn't I want him to know I lived there...or visiting there too?
   Perhaps the residents in my neighborhood are not neighborly to outsiders, because..