Congrats on your weight loss and maintenance!! I would say ignore them too, but it is really hard to do that. It sounds like you are healthy and happy (113 lb sounds like a great weight for your height - I'm 5'5" and my BMI says I could go as low as 110 lb). You could just tell them that. If you want to go further, tell them your doctor also says the same thing. You can also say that you want to make sure the weight stays off that's why you track your food. It sounds like it's a smart thing to do to me.
It sounds like weight watchers isn't providing the right support for you anymore or you need a new leader. I would say a support person should NEVER say things like that, even if it was true.