Without getting into the IT-sexism-blah-blah, 'your mother wears combat boots' isn't just a folksy turn of phrase: it's a fifties-era impugnment of lesbianism. So unless you want to sound a lot more Republican than you were probably intending, you should probably stop wondering why you don't have more female friends, coworkers, and partners. And by the way, a foot in the mouth is so gay.