no.
girls just wanna have funds
bruh...we're not even talking "thick" here...were talking OBESE.
I already answered you... And as I said, you can say whatever you want, it just won't earn you any smiles.

Of course you can comment. But not surprisingly, it was taken the wrong way by a woman trying to protect her chubby friend from a man she thought was making fun of her. That was likely what it was: protectiveness towards her friend. Even if you didn't mean it in an offensive way at all, she still went ''well, she is fat but don't say it, that's mean!'' because there usually are people talking about fat girls behind their backs, making fun of them.
You can comment but it's not, how can I put it... politically correct to do so. The politically correct thing to do is to be the blind-to-appearances guy who says beauty is actually inner beauty, that beauty is in the eye of the beholder and yadda, yadda, yadda. Of course it's not true from an aesthetic point of view, but the world is filled with white lies for a reason. It's what people want to hear, it's what makes them feel good about themselves.