Guys, shy males... If you don't like a girl?

Anonymous
How do you deal with it? I know most guys aren't gonna be rude and not say hi to someone... But for you shy guys... How do you treat a girl who comes up to you if you don't like her. Aren't interested in seeing her or don't think she's pretty? Give me a nice list. Pretty please!
Updates:
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Update...
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Any other shy guys?
Guys, shy males... If you don't like a girl?
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