Toddler 3(f), very girly she's starting to dislike boys etc her dad,grandfather and uncle

Hi guys I have a very girly toddler aged 3, she's a very sweet kid but lately she's gone totally off boys, as in saying only girls play with girls , boys are not friends and saying she can't like her male relatives as they are boys , it's starting to hurt her dad,grandfather and uncles feelings as she's the only grandchild and is actively ignoring them on purpose , saying she 'll only give her girl relatives kisses and cuddles and talk to them. I 've tried explaining that girls can be friends with boys but she's gone really stubborn about it disagreeing in her threenager way , any idea on how to approach this properly? Thanks via /r/Parenting http://ift.tt/2rFgJLJ