Living somewhere else where it's quite common to have a homeless person come up to you on the street and ramble on with a muttered 'excuse me madam sorry to bother you but...' low monotone that almost exclusively leads up to 'give me money' - yes. You learn what to say to instantly tell people you're not one of them. And it does lead to a general avoidance of other people on the street. Having said that, I'd like to think that if someone genuinely needed help it would be a little more obvious and they would get it...