There is nothing wrong with her comment. She isn't dissing anyone. She listed examples to illustrate her point that all the popular women in the business have this typical look. This is perfectly acceptable. She is simply trying to ensure that everyone understands what she is speaking about.
She even stated how it is possibly that it's the industry executives who cause this because they wanted her hair long too.

I love Rihanna and all the ladies she mentioned. Let's not allow our biases to let us imply what was not inferred. I mean.. how did dominatrix outfits, voice comparisons, etc get into this discussion? Stop the HATE! I want to see all the ladies succeed so we can have some variety.

PS. If you dont like her voice (I suspect b/c she is not american)that doesnt mean her style isn't fly.