How to get these girls to SHUT UP?

Okay so yesterday I got finished working in the garden I was FILTHY, covered in dirt from head to toe, and some girly girls across the room started saying “Oh look at her she is so filthy and ugly, and she always is dressed like a boy.” I just wanted to smash in their faces but I ignored them and started playing Pokemon with some friends. And then they were like “Oh she plays Pokemon? I thought that was for boys.” And I am getting madder at them every day because they make fun of me for being a tomboy and just yesterday they said I like the guys I hang out with when skateboarding,When I don’t! What do I do? I know I’m not going to tell an adult. so, what else should I do to shut them up?