Even if the street corner preacher was sincere, he was wrong for pointing you out because of what you wore. Even though that is a human trait regardless how enlightened we are to base first impressions by what we see. I try very hard to get past the first impression and meet the person and learn who they are before settling on a lasting impression. If they continue to "screw" me over in some way then I will walk away from them, if not then who cares how they dress...