I had surgery in 2013 and went from a size 20 to a size 4.

I've been dating a guy for 3 1/2 months. He has noticed that I don't eat much and teasingly suggested I order off the kids' menu. He also has mentioned several people he knows that are overweight and recently he said something about WLS people not realizing they would have excess skin (I have excess skin). I think he's realized that I've had WLS, but I also think he's very biased against overweight people as well as those of us that have had surgery.

How do I tell him that I fit into the category of people he looks down on?????