My Obvious Eating Disorder

I'm thin, and I can't help it. Anyone who has seen me eat, knows that I can put away food like no other. I just can't gain weight. Perhaps I have worms, I don't know. What has really been bothering me a lot lately is the amount of comments I've been getting from people about how they're concerned I'm anorexic.
Mind you, I haven't been loosing weight, if anything, I've gained some, but for some reason, the last year or so, I've got a lot of comments from a lot of different people saying they're concerned about me being anorexic. I've had enough people comment on it that I myself got concerned that maybe I do have an eating disorder and didn't realize it. So, I did what any responsible person would do, and started counting my calories to make sure I am eating enough. Turns out that a typical day for me consists of anywhere from 2500-3000 calories. Like I said, I can eat a lot.
Part of the problem is that I don't even try to defend myself anymore when someone accuses me of it. People already have their mind made up about it, so let them think what they want.
Last night, while I was eating, someone told me he thinks I'm anorexic. Right, because I'm holding a plate loaded with food, obviously I am. I don't understand the double standard here. I would never tell someone they're fat, but it's okay to accuse someone of having a disease that could be life threatening. Plus, I don't think I look anorexic. Yeah, I'm skinny, but I'm not that skinny that I would think people would think I don't eat. Maybe I am though and should start eating Crisco in hopes of putting on some weight. More likely though, I'm just not going to worry about it and bitch slap the next person who asks me about my eating disorder.