First date went well, second date she is immediately bitchy?

It's really weird, we connected well on the first date (or at least well enough for us to both want a second date) but literally within the first 15 seconds she's extremely bitchy and distant? At one point I touched her shoulder and she's like "Don't touch me." Have any of you ladies ever done this to a guy? And why did you do it?
First date went well, second date she is immediately bitchy?
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