YANBU.
It’s not just weight, it’s everything…. I’m overweight and oddly, don’t get comments ‘Oh, you’ve put on weight, you look amazing’, however when I lose it (Yo-yo dieter trying to sort her life out, here!) I get everyone complimenting me ‘Oh, you’ve lost weight, how much have you lost? How did you do it?, you look amazing’
I’ve got naturally very large breasts and have got a LOT of comments ‘At least mine won’t be down to my knees when I’m 40’ or.. ‘I prefer women with smaller breasts, anything more than a handful is a waste’ etc etc etc… I was born this way, losing weight makes them slightly smaller, but they are still very large. I don’t ask for comments, nor do I wear anything low cut – if anything, I cover up more… yet people seem to think it’s OK to comment on my chest.
Equally, one of my sisters is very small on top and she gets the opposite… Hurtful jokes all round. 
Growing up, there seemed to be more ‘social acceptability’ to insult me than my sister as every woman wants massive knockers, right?
yet if a woman has a small chest – poor her, pity her and hand her a plastic surgery leaflet….
I agree with the posters who say you shouldn’t judge people on their weight or appearance… It’s a shame so many still do.