Is this wrong for a coach to be saying about me?

So, I'm not the thinnest skater alive. I'm 5'6 and about 143 pounds. There is a coach at my rink that lovess to point me out to her skaters and tell them how if they don't eat right they'll end up "looking like me". I'm not unhealthy. I skate 25 hours a week and dance about 10. I've always been self conscious about my weight. When I was about 11 I started counting intake and burned calories. It went from about 2000 calories down to 500 at my worst. My coach (who is also the skating director) knows of this and constantly monitors what I eat (he's basically like my dad). However he doesn't know what this certain coach has been saying and I really don't want to drag him into it. How can I confront her about what she's been saying without making a big scene?