I think sometimes folks don't know how to deal with offering treats - it feels rude to offer a treat to other people and exclude you so they offer it trying to be inclusive. I bet if you reassured them a couple times - "thanks for offering but I am avoiding all sugar and starches. I won't take it personal at all if you don't offer me treats - you'll be helping me stay strong!" that they'll stop offering.

As for skinny bitch its just a popular term, I bet watching you melt and being significantly heavier than you, you probably really are seen as 'skinny' from that perspective even if you aren't as skinny as you want to be yet.