Could someone please explain to me.... WHY guys feel the need to call you a "hoe" to your face or to…

Could someone please explain to me.... WHY guys feel the need to call you a "hoe" to your face or to your man, just because you're pregnant? Has anyone else has this experience? Because I'm really not a "hoe" at all, but if a I wanted to be, why is that such a bad thing? I hate the ridiculous double standards.