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It should affect your confidence a little... when you say hi and someone leaves, it is a brush off. You are asking them to commit to interacting with you when you say hi.
It is not always meant to be offensive though, it can mean a number of things, so acting on it is difficult. If someone visits there is a part of them that is interested. For those you haven't met you are asking them to decide to choose you right then and there, to take the next step. For those you have met, they are probably waiting for someone else.
(Don't underestimate the waiting for someone else crowd though, they are still interested. I have been waiting for one ACF model for the last few weeks, and spent on others while waiting...still not seen her for long enough to spend on her yet....so one model is missing out on my tokens to those I favour less)