there are just some people out there who just don't think before they speak or realize the effect of what they say can have on someone.
I have a older sister who is very slim (and always has been) who keeps making destructive comments about my weight. The first time I joined WW I told her, and every week there was a concerned "phone" call asking about my progress, but at the end there was always some kind of sarcastic comment. Or I would go round and be eating something and she would say - "not that low fat diet crap - I don't want any".
When I rejoined WW this time, the only person I told was my husband and he (fortunately) is very supportive. I have decided that I need to lose weight for me and anyone who is not prepared to help me attain my goal, does not need to be part of the equation. My WW group also pointed out that it could be a jealousy/threat thing with my sister as she is older than me. I pointed out that I would never be as thin as her and they said never say never. I am not competing with anyone, the only person I am competing with is me and that at the end of the day is what really counts.
So to sum it up (boy I do go on

) ignore the destructive comments and carry on. No doubt the same people that are putting you down will be the same people praising you when you get to your goal
Oh I forgot - what does 10lbs mean to me. It means that I can lose weight, that I have the determination and the willpower and that new outfit is just that little bit closer!