Ummm...they don't.
Unless your talking about sharing personal information with someone you hardly know cause thats a different story

Don’t know what kind of girls you are hanging out with.

Honesty is always good,
Honesty can do no harm,
Unless you're shallow and don't want to hear the truth.

Says who? I always appreciate honesty not rudeness tho.

Girls and women (and everyone really) prefer honest guys. Maybe you are approaching girls who honestly want something other than what you honestly are offering?

Girls meaning women? 🤔

Young women hate honest guys until they get burned by a few nasty liars...after that they love honest guys..

...if you literally mean girls, then I would say because girls get told fairy tale bullshit that inevitably gets shown by life to be utter lies..as do boys..unfortunately..