MJ:
You are never responsible for how other people feel about you. Their issues are their own. By the same token, you don't owe anyone any particular kind of response to their words or actions. If it hurts you, it hurts you. Be true to yourself and allow yourself to feel that - it is you, and it is fine!
The important thing is that you ARE working on it! Keep at it... you're doing fantastically.

Like most of us on here you became unhappy with your weight/health. That's a fundamental thing to accept and change about yourself - of COURSE you are still going to be sensitive about it... No-one EVER enjoys having their failings pointed out to them - no matter how well meaning the pointing is.

*huge hugs*
Steven