Why do girls get nervous when guys compliment what they are wearing or say they look sexy?

mrsingle
It's happened to me so much. I'm out at a club or bar, go up to a nice looking girl, introduce myself and compliment on what she's wearing (what I compliment varies depending on the girl). Sometimes I'll say something looks hot on her.
Immediately after she looks creeped out, that noticing what she wears is weird or doesn't want the attention. Sometimes I've even been called a pig.
Yet we are out at a club, she is single, and I don't believe a girl wants to "look bad" so I know she dresses to look good. So why hate me for complimenting her? This happens so much I stopped complimenting girls but that hasn't changed my luck in dating.

I know some Men may have taken advantage of these girls in the past and that can make them insecure, but complimenting what someone is wearing is never a bad thing, and a Man would NEVER take it badly is a girl said that to him!
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Why do girls get nervous when guys compliment what they are wearing or say they look sexy?
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