@youresoquiet
Ironically you're quiet on your thread since you posted the original post!
Just kidding. 
I know what you mean. Although I have never had this comment directed at me, I have had similar comments, like 'why do you always wear your hair in the same style?' 'why have you got BLACK nail polish' on, and 'are you eating AGAIN?' and similar bitchy comments. There always SOMEone (in the workplace,) who has an opinion about you, and it's fucking annoying. 
I can think of something similar to what you said. A few years ago, there was a woman (I'll call her Kate,) who started to work at the place where I worked. She was really lovely. Like really gentle and kind, and looked after hedgehogs and stray cats and wild birds...
One of the supervisors, (Pat,) said to her REALLY loudly in a staff meeting 'by the way Kate. You HAVE to stop being so NICE, it's sickening! SO NICE. And no-one impressed with saving the birds and hedgehogs here, we want HARD WORK and RESULTS!' Then she threw in a loud roar, and threw her head back, to make out it was a 'jokey banter' comment. It wasn't. She meant every word. She was a bitch.
Poor Kate went flame red, and smiled awkwardly. Ben, one of our colleagues said 'aww Kate, you don't need to change who you are.' Pat glared at him.
But yeah, Pat was one of 'that type' who always had something negative to say about someone. I think she was a miserable cow who had a miserable life, so I think she wanted everyone else to feel as miserable as she did. And it IS negative to keep making personal comments about someone's personality, or dress sense, or weight etc...
For what it's worth, I prefer quiet people, and fucking LOATHE loud, shouty, people, who won't stop bastard TALKING! 