It's not incorrect, it's just diminutive and can be insulting in a professional setting. Going out with the girls and having a drink with my boys are perfectly

It's not incorrect, it's just diminutive and can be insulting in a professional setting. Going out with the girls and having a drink with my boys are perfectly fine things to say when referring to your friends. Similar to how bro is thrown around, you wouldn't describe your colleague that way.