Why do guys like to insult girls?

When it comes to guys they are a little stupid because this is usually the technique they use to get to know a young lady they may be interested in.  This is what Adrian told me.  Not a great way to get a young lady to like a young man.  They kind of fumble.

Cause their parents didn't raise them with any morals

Some guys do it because they don't know how to treat a woman. When I do it it's because I have a familial feeling with them, but I don't cross certain boundaries and make sure it's something we can both laugh at. It also helps that I make jokes about myself and go off on tangents from time to time that way she understands that she and I are equals.