Weight loss :: Top 5 Weight loss Ideas

It sounds incredibly vain, but I’ve worked hard for six months to lose weight. I am 5′2 and went from 169lbs to 122lbs
But I recently went to a holiday party where I ran into old co-workers who haven’t seen me in months. No one actually said “have you lost weight?” There were plenty who said “you look good!” I was a little peeved when one girl said “you look good, what have you been doing?” and I said, “well, I lost some weight” and she said “really?” as if she didn’t believe me.
Just wondering, what is the ettiquette is on this. Do you actually say somehting about weight loss or worry it will be offensive? Do you say something like “you look good” instead? I am thinking that is what they mean, but I can’t help feel a little frustrated that I dropped a good amount of weight and no one has said anything.
I do feel good and know that I look better, but its natural that I would want others to notice all the hard work.