Why do some girls try to embarrass their friends in front of guys?

Seriously like what is the reason? Is it to make themselves look better by comparison? Guys, do you notice/care when this happens?
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I just saw this video where this girl tripped one of her friends over in front of a group of guys and was trying to hog the attention. Are they not embarrassed?
Why do some girls try to embarrass their friends in front of guys?
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