I think that if someone called me a skinny b* I would hug them. I could care less how they meant it.

Then again, being called that by my close friends doesn't offend me at all, it's more of a joke we have.
As far as the thinner/older face goes, I remember someone here posting (I'm sorry I can't remember who it was) about that several months ago. I think about it a lot as my face is thinning out and I do think I look a little older than I did. - It was something like "My face did look younger when I was heavier but I seriously doubt that when I walked by everyone was thinking, 'Wow! She sure does look YOUNG!'"