I think that about 80-90% of what people say has everything to do with them and their viewpoint and very little to do with you and your situation.

She may well have made a good (if insensitive) point. It wouldn't bother you if you didn't partially agree with it at some level. But so what, you're attending to much more important matters of health and wellness. Being in shape enough to race this season is of microscopic importance compared to that. As long as you are confident in yourself and know that you are working on what is most important, screw the rest.