Before you meet your new coworker, I should warn you: she's lesbian. That's why she dresses like a man.
That comment doesn't sound right. What do you mean by that's why she dresses like a man?
It's a joke, how many inches are you?
It's not right to categorize all lesbians as crossdressers. Doing this will cause you to incorrectly assume someone's sexual identity, which can be hurtful and insulting to the person.