Men negotiate for higher salaries, up to nine times more than their female colleagues. And we are constantly told that we are not confident enough, funny enough, showing off enough, or simply ballsy enough to do this well. None of that is true, but there are some things we need to work on and things we definitely shouldn’t do. We came up with a list of definite no-no’s for negotiations. Here are 9 things you shouldn’t do when asking your boss for a raise.