How do I make them shut up?

I've started going out with this guy and I like him a lot but everyone around me just makes fun of us. They say we have excessive PDA when the most we do in public is a peak on the cheek and holding hands. They also make fun of the fact he's a ginger. Plus, now they're starting to call me a slut and . I'm usually really good at ignoring things but its starting to get on my nerves. How do I make them shut the **** up? Is there anything i can say?