That comment was completely unnecessary. I don't think any cosplayer is under any responsibility to appeal to anyone's idea of what a character should or shouldn't look like.
Cosplay is for fun. So any un-constructive criticism is completely unnecessary. If you're trying to help someone improve in doing what they love that's fine, but if you're just going to leave negative comments you're kind of an ignorant human being as a whole.
I know what you mean!
Ha! They think its okay even if they don't look like the person and is a little fat...
BUT ITS NOOOOT!!