Why do some women act rude toward shy or nervous men?

This has been my observation from my school if there is a nervous guy or a nervous man.
Women tend to be obnoxiously rude to them.
Sometimes destroying their self image.
True Men don't do that.
Women you know that right he is making or trying to make you comfortable but In the process he doesn't want to get too close where you feel threatened.
Example group or class photo,
A random dance call , you know right if you don't want to then you can be polite and declined.
Most of the time a polite decline is enough to make a guy understand.
A guy has been trained to listen to 'no'.
You don't have to be rude, and make a scene or set an example.
If he is forcing or saying come on even if he is nervous about it he is giving it all to.
But at that moment no and sitting down is much better.
Why do some women act rude toward shy or nervous men?
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